Instruct Kajetan

To instruct Kajetan please contact our clerks on +44 (0)20 7842 5555 or email [email protected].

Kajetan has a broad commercial chancery practice in London and offshore. He has attracted unusually early recognition from the market, with repeated directory rankings in major categories since his third year in practice. Recent recommendations include “a future leading counsel”, “operating at a level far beyond his call”, and “an outstandingly talented junior who is destined for big things.” He was named by The Lawyer magazine on its list of the “Hot 100” lawyers in England in 2024.

His practice focuses particularly on heavyweight commercial fraud disputes and associated interim remedies such as freezing orders, as well as non-fraud commercial work in a broad range of sectors, including shareholders and joint ventures, commodities, transport, infrastructure, and insurance. He works equally frequently with King’s Counsel from these and from other chambers, in most cases as a team of two.

Alongside his junior work, Kajetan maintains a substantial unled advocacy practice both in the High Court and in arbitrations, appearing almost invariably against counsel many years his senior and increasingly often against KCs. His advocacy has been noted in the directories as “brilliant”, “excellent” and “what looks complex, he makes sound simple”, and in a High Court judgment as “conspicuously clear and helpful”. Several of the cases which he has argued as sole counsel have been cited in major practitioners’ textbooks, including (amongst others) Chitty on Contracts, Lewison on the Interpretation of Contracts, Benjamin’s Sale of Goods, and Clerk & Lindsell on Torts, as well as widely covered in legal updates such as law firm newsletters and articles.

  • “Kajetan is unbelievably clever. What looks complex, he makes sound simple.” – Chambers & Partners 2025, Commercial Dispute Resolution
  • “Kajetan is a future leading counsel. He is supremely intelligent and incredibly hard-working.” Legal 500 2025, Commercial Litigation
  • “Kajetan is a brilliant advocate with an amazing work ethic.” – Legal 500 2025, Fraud: Civil
  • Rising Star – Legal 500 2025, Shipping
  • “Kajetan is operating at a level far beyond his call. He is as bright as they come, responsive, great with clients and extremely pragmatic.” – Chambers & Partners 2024, Commercial Dispute Resolution
  • Brilliant ability to absorb large amounts of material and quickly produce clear advice. He’s also an excellent advocate.” – Legal 500 2024, Commercial Litigation
  • Kajetan is an outstanding junior barrister. He is fantastically smart and has a clear thirst for the work itself, which makes piloting cases alongside him a pleasure.” – Legal 500 2024, Fraud: Civil
  • Rising Star – Legal 500 2024, Shipping
  • Rising Star – Legal 500 2024, Consumer
  • Up and Coming – Chambers & Partners 2023, Commercial Dispute Resolution
  • “Fantastic attention to detail and insight, and yet still able to clearly see the bigger picture. He has a natural aptitude for complex construction cases. An outstandingly talented junior who is destined for big things.” – Legal 500 2023, Construction
  • Rising Star – Legal 500 2023, Consumer
  • “conspicuously clear and helpful submissions, both oral and in writing” – XXX v Persons Unknown [2022] EWHC 2776 (KB)
  • The Lawyer magazine Hot 100 2024

Kajetan specialises in commercial fraud disputes, for which he is recommended by the Legal 500. His cases range  from single-forum cases to heavyweight multi-jurisdictional litigation involving simultaneous proceedings in London and multiple foreign jurisdictions onshore and offshore. His practice is roughly balanced between acting for claimants and defendants, both as sole counsel and as junior to leading Silks in the field.

He has experience of all major English law causes of action relevant in fraud claims, including deceit, breach of fiduciary duty, conspiracy, breach of trust, dishonest assistance, unlawful interference, procurement of breach of contract, bribery, and intimidation; statutory fraud claims under the Insolvency Act and FSMA; as well as fraud claims governed by foreign systems of law. On the procedural side, he advises on and provides advocacy in relation to all procedures relevant in fraud claims, such as freezing orders, service out, disclosure applications under the Norwich Pharmacal and Bankers Trust jurisdictions, contempt of court etc., as well as matters where fraud or allegations of fraud affect the process of the court itself rather than being the subject of the dispute.

During the Hilary term 2021 (January to March), Kajetan worked as a full-time Judicial Assistant in the Commercial Court, assisting judges on several complex fraud matters. In particular, he was a judicial assistant to Cockerill J on Leeds v Barclays [2021] EWHC 363 (Comm) (a LIBOR-related fraud claim and a significant case in the law of misrepresentation), to Jacobs J on GDS v NCR [2021] EWHC 1119 (Comm) (a claim raising all major economic torts), and to Bryan J on Lakatamia Shipping Co Ltd v Su & Ors [2021] EWHC 1907 (Comm) (unlawful means conspiracy).

He often works on cases which attract media coverage.

Featured Civil Fraud cases


  • Acting for Dr B.R. Shetty in multi-billion fraud disputes proceeding simultaneously in London and in several offshore and onshore jurisdictions worldwide (led, with substantial elements of unled work and some unled appearances).

  • Acting for the defendant vendor in an 8-figure deceit claim in respect of a share sale (led).

  • Acting for beneficial owners of a substantial industrial asset in Ukraine in disputes raising allegations of theft of USD 100 million worth of stock (led).

  • Acting for an ex-CEO in USD 50m+ claims asserted by his former company alleging dishonest breaches of various directors’ duties (led).

  • Advising an UHNW individual on permitted transactions under a number of overlapping freezing orders in England and several offshore jurisdictions (sole counsel).

  • Acting for the claimant syndicate in a high-profile dispute with a well-known racehorse trainer (and other parties) concerning inter alia the trainer’s undisclosed interests in valuable horses purchased by the syndicate (led).

  • Acting for a subsidiary of a large PLC in a case concerning siphoning off of company monies by trusted employees (sole counsel).

  • Advised a joint venturer on claims against a partner in respect of misappropriations from the JV coffers (sole counsel).

  • Acted for an individual trying to recover money lost to a cross-border internet fraud perpetrated by unknown defendants, including freezing relief against Persons Unknown and a successful substantive claim (sole counsel).

  • Providing general advice to a local authority in respect of strategy for clawing back fraudulently claimed COVID-19 business support grants (sole counsel).

  • Defending the seller of a valuable classic car from a claim in deceit concerning the structure of his interest in/title to the car (sole counsel).

  • Several complex / novel Norwich Pharmacal and Bankers Trust applications (sole counsel).

  • All kinds of work related to freezing orders from both the claimant and the defendant perspective, including obtaining, resisting, discharging, complying with and policing such orders.

Kajetan is recommended for Commercial Dispute Resolution by both Chambers & Partners and the Legal 500. When he was first ranked in this area, he was the most junior barrister recommended for commercial litigation in Chambers & Partners, alongside counsel many years his senior – reflecting the nature of his general commercial (non-fraud) practice described in the directory as “operating at a level far beyond his call”. Although no longer new to the rankings, he remains one of the most junior barristers in the current editions, reinforcing that description.

He acts extensively in general commercial disputes, both as a junior and as sole counsel. He has worked for a full range of commercial clients: corporations, SMEs, joint ventures, public authorities, company directors, and UHNW individuals. He frequently advises on strategy and procedure, and is noted by clients for his focus on the interplay between the legal analysis and the commercial aims of the litigation. The 2023 edition of the Legal 500 described him as having “Fantastic attention to detail and insight, and yet still able to clearly see the bigger picture.”

During the Hilary term 2021 (January to March), Kajetan worked as a full-time Judicial Assistant in the Commercial Court and the Financial List (to Cockerill J, Jacobs J, and Bryan J).

Kajetan enjoys working in large teams, and quickly integrates into the team.

Featured Commercial Disputes cases


  • A EUR 70m+ Commercial Court dispute between a private equity house and a Lloyds syndicate in respect of warranty & indemnity cover for a share purchase transaction (led).

  • Circuit Commercial Court dispute between one of the largest ports in the UK and a well-known ferry operator in respect of minimum performance guarantees (sole counsel). Following the close of pleadings, Kajetan’s client obtained summary judgment on all relevant points of contractual construction, resulting in an immediate judgment for 99% of the value of the claim: PD Teesport v P&O North Sea Ferries [2023] EWHC 857 (Comm).

  • A USD 130-million dispute in respect of the termination of an aircraft lease following the Russian invasion of Ukraine (led).

  • A USD 80m+ LCIA arbitration concerning sale contracts for propane (led).

  • A Circuit Commercial Court dispute between a mailing fulfilment company and a very large online retailer in respect of freight forwarding services (sole counsel).

  • A Commercial Court dispute between a holder of a demand bond and a bank in respect of delays in payment (led).

  • Advised a large NHS Trust on defending a claim (alleged to be worth over £600,000) in respect of a contract for the provision of television and telephone services to patients at wards (sole counsel).

  • Sole counsel in a number of matters raising important points of procedure, e.g. Barclays Bank Plc v Shetty [2022] EWHC 19 (Comm) (application to adjourn for the purpose of obtaining legal representation); XXX v Persons Unknown [2022] EWHC 2776 (KB) (party anonymity in a case of computer hacking); and PD Teesport v P&O North Sea Ferries [2023] EWHC 857 (Comm) (quality of evidence necessary to defeat a summary judgment application).

  • Advising on a variety of Russia-related sanctions matters, e.g. a British engineering firm on the lawfulness of a proposed transaction with a Russian client with links to the state; a company operating in the maritime sector on supplying services to superyachts with opaque ownership structures; a company specialising in hiring out stage equipment who had provided equipment for a Moscow theatre production; a producer of industrial machines on the deposits it held which had been paid by its Russian distributor on account of orders for machinery; a UK charity on donations received from a Russian charitable fund linked to a prominent oligarch (all as sole counsel).

Kajetan has substantial experience of document- and expert-heavy disputes concerning engineering projects and infrastructure, both in arbitration and in litigation. He was recommended as a “Rising Star” in the Construction category in the 2023 edition of the Legal 500, which described him as having “‘Fantastic attention to detail and insight, and yet still able to clearly see the bigger picture. He has a natural aptitude for complex construction cases. An outstandingly talented junior who is destined for big things.” Ranked at only three years into practice, Kajetan was the joint most junior barrister recommended in that category.

Featured Construction projects, infrastructure and engineering cases


  • A USD 800m ICC arbitration between the main contractor and the lead designer in respect of a major infrastructure project in the Middle East (led).

  • TCC litigation between engineering consultants and the main contractor in connection with design services and building information modelling (BIM) for a major infrastructure project on an offshore military base (led).

  • A complex £8m adjudication regarding the construction of one of the largest schools in the country (the issues included the appropriateness of advice on the form of procurement, duties to warn, management of value engineering, experts’ conflicts of interest, and the extent to which important facts can be inferred rather than proved by direct evidence) (led).

  • In pupillage, assisted with a USD 150m ICC arbitration between the main contractor and a subcontractor concerning defects in Heat Recovery Steam Generators in a combined-cycle thermal plant.

Kajetan is ranked as a Rising Star in shipping disputes by the current edition of the Legal 500. He has experience of a variety of matters concerning the international trade and transport of goods, including sale of goods disputes, delays, misdelivery, damage to cargo, discharge of cargo against Letters of Indemnity, detention and arrest, and exclusions of liability. He has practised in the area since commencing independent practice in 2019, having spent a significant proportion of pupillage on assisting with shipping  matters such as The “ELIN” [2019] EWHC [1001] (Comm) (the current authority establishing that the statement on a Bill of Lading that the carrier would not be liable for loss of or damage to deck cargo “howsoever arising” is apt to exclude liability for negligence and/or unseaworthiness) and The “Arctic” [2019] EWCA Civ 1161 (an arbitration appeal in which the Court of Appeal determined the status of the obligation to keep a vessel in class), an LMAA arbitration arising out of long-term detention of a vessel in Venezuela, an LMAA arbitration in respect of a failure to redeliver a barge concerning the availability and quantum of restitutionary damages for conversion, and various other matters.

Featured Shipping and international trade cases


  • For owners in two LMAA arbitrations in respect of discharge of cargo against letters of indemnity (led).

  • Concurrent LMAA arbitrations concerning a delay caused by repairs to a vessel’s ballast water treatment system (sole counsel).

  • An USD 80m+ LCIA arbitration concerning sale contracts for delivery of refrigerated commercial propane (led).

  • A USD 3m+ LMAA arbitration concerning whether a charterparty of a specialist offshore support vessel was frustrated when the planned operation became impossible due to the Covid pandemic (sole counsel).

  • Acted for a salvage company in defending a cross-border claim in respect of an alleged joint venture (sole counsel).

Kajetan advises on and acts in insurance matters, for example in respect of coverage disputes, fraud, as well as subrogated claims. In the latter category, he has particular experience of claims for damage to or destruction of property by fire, but has also dealt with matters arising out of other perils such as flood, building subsidence, and voltage damage to electrical equipment.

Featured Insurance and subrogated claims cases


  • Second junior counsel in a EUR 70m+ Commercial Court dispute between a private equity house and a Lloyds syndicate in respect of warranty & indemnity cover for a share purchase transaction.

  • Advised on D&O policy coverage for multi-million-dollar claims arising out of credit facilities (as a consultant to a leading solicitors’ firm).

  • Advised a major Channel Islands insurer on repudiating cover for a fraudulent notification.

  • Advised an insurer on a fraudulent claim for loss of earnings on a personal accident policy.

  • Advised a foreign lawyer on coverage under a professional indemnity policy.

  • A subrogated claim for fire damage caused by a defective electrical distribution board

  • Advised in respect of claims against landlords for fires caused by their tenants which then spread to neighbouring properties causing damage.

  • A subrogated claim in in respect of negligent installation of a wood-burning stove which caused a large fire.

  • A subrogated claim against an electric power distribution network in respect of extensive damage to electronics in a “smart home” caused by a surge in voltage.

  • A subrogated claim relating to flood damage to a home caused by negligent works to the adjacent road.

  • In pupillage, assisted with a number a large-scale insurance disputes such as a claim by a major insurer against a coverholder in respect of risks which it was alleged the coverholder should not have written, and an arbitration between two major insurers concerning which of the two insurers is liable to meet a multi-million personal injury damages judgment.

Kajetan handles a variety of banking and financial services matters, both contractual and regulatory. He has experience of the Financial Services and Markets Act 2000, the Financial Services Act 2012, and the Regulated Activities Order, in particular of civil enforcement claims by the FCA. He is also regularly instructed by banks, particularly in claims arising out of commercial financing such as business lending, guarantees, sales ledger financing, etc. He regularly publishes articles in the area.

Featured Banking and finance cases


  • Proceedings under ss. 380/382 FSMA in respect of a £200m+ unauthorised collective investment scheme.

  • Advising a group of institutional investors in connection with proposed large-scale securities litigation under ss. 90A FSMA (led).

  • Advised a bank in relation to a claim for alleged breach of the Quincecare duty of care.

  • Acted for a bank in relation to alleged misreporting of suspicious transactions.

  • Acted for a bank in a successful summary judgment application in respect of refinanced debt of a construction company.

  • Acted for a bank against directors of a company in a claim on personal guarantees of loans to the company.

  • In pupillage, assisted with restitutionary and injunctive proceedings concerning communication of invitations to engage in investment activity through Information Memoranda not approved by an authorised person, as well as misleading financial projections.

In addition to commercial disputes, Kajetan has built up significant experience of advising and acting for businesses on high-risk disputes with consumers requiring delicate strategy and difficult judgement calls. He is very rarely if ever instructed in “regular” consumer disputes such as about quality of goods or services, but he is often called upon by businesses facing consumer claims giving rise to risk of regulatory action, carrying adverse media interest, or having potential wider repercussions by establishing a precedent.

He regularly advises and acts for clients operating in regulated sectors, such as banks and gambling operators, and has advised and acted for businesses facing consumer claims arising out of COVID-19 since the early days of the pandemic. He also has experience of assisting businesses facing large cumulative exposure to waves of low-value consumer claims in respect of the same subject matter coordinated on social media or similar channels, from early strategic advice, through advising throughout the disputes, drafting pleadings and/or applications, to advocacy.

His work in this specialist niche has been recognised by the Legal 500, where he is the most junior barrister recommended  in the Consumer Law category for the second year running.

Featured High-stakes consumer disputes cases


  • Longley v PPB Entertainment Ltd [2022] EWHC 977 (QB); [2022] LLR 436; [2022] CLY 532: successfully defending the bookmaker Paddy Power in a £286,000 claim in respect of a horseracing bet. The case was extensively covered in the press, both domestic and international, and the judgment has been discussed in various case notes and commentaries, and cited in several passages of Chitty on Contracts.

  • Advised a major online betting exchange in respect of hundreds of coordinated claims relating to the same betting market.

  • Advised and acted for a holiday park operator in successfully defending multiple claims related to park closures caused by the COVID-19 pandemic.

  • Advised an online bookmaker in respect of its exposure to ca. 120 County Court claims totalling over £500,000 in respect of the same subject matter.

  • Advised and acted for a bank in proceedings brought by a company director concerning alleged wrongful notifications to a fraud prevention agency.

Kajetan has a niche specialist practice in gambling disputes, advising and acting for large gambling operators as well as their customers. He has experience of the whole gamut of such disputes, from contractual (bet outcome disputes, issues of cheating/dishonest bets, withholding of winnings pending completion of integrity investigations) through tortious (problem gambling, self-exclusion) to the interface between findings of regulatory authorities and private law actions between the customer and the bookmaker. He has handled matters ranging from high-value claims about a single bet, through disputes with VIP customers, to disputes about the correct settlement of a market involving hundreds of individual claims (whether coordinated or not).

Kajetan has particular experience in bet outcome disputes in respect of events without an obvious mathematical outcome or official result of a governing body, where the gambling operator has made an evaluative judgement, for example as to the correct result or the appropriate time to close betting.

Complementing his practice in gambling disputes is Kajetan’s practice concerning racehorses, in which area he has been acting for and against several well-known owners, trainers, and auction houses.

Featured Gambling, betting, and horseracing cases


  • Advised a major bookmaker on settlement of bets on events cancelled and postponed due to COVID-19 (both one-off events such as matches/tournaments, and long-running events cancelled or postponed mid-way such as leagues).

  • Longley v PPB Entertainment Ltd [2022] EWHC 977 (QB); [2022] LLR 436; [2022] CLY 532: successfully defending the bookmaker Paddy Power in a £286,000 claim in respect of a horseracing bet. The case was extensively covered in the press, both domestic and international, and the judgment has been discussed in various case notes and commentaries, and cited in several passages of Chitty on Contracts.

  • Acting for the Claimant owners syndicate in an ongoing high-profile dispute with a well-known trainer, subject to numerous articles in specialist and national press.

  • Sole counsel for a well-known thoroughbred auction house in a dispute with a buyer.

  • Advised an online bookmaker in respect of its exposure to ca. 120 County Court claims totalling over £500,000 in respect of the same subject matter.

  • Acted for a major bookmaker in defence of a claim brought by a high-value customer whose winnings were voided on the basis that he had been at the centre of a horserace-rigging conspiracy (successfully ended with the claimant being forced to abandon the claim at an early stage).

  • Acted for a betting exchange in successful defence of several claims in respect of bets on the date of a party leader’s official departure from office, the main issue being a betting exchange operator’s implied Braganza obligations when resolving bets between customers.

  • Advised a major online betting exchange in respect of hundreds of coordinated claims relating to betting on the outcome of the 2020 US presidential election.

  • Advised a betting exchange on multiple claims in respect of its settlement of a domestic political event market

  • Drafted the operator’s submissions to a betting adjudicator in a successfully defended six-figure adjudication brought by a customer in respect of betting on the date of the UK’s withdrawal from the European Union.

  • Acted for a bookmaker in a successful defence of a claim in respect of alleged breach of a self-exclusion agreement.

  • Acted for a bookmaker on a successful strikeout application in a claim in respect of freezing a customer’s winnings for 10 months pending an integrity investigation.

  • Advised a number of problem gamblers on recovering their online gambling losses.

Kajetan has experience of IT and telecoms disputes, e.g. concerning hardware, software, and internet projects, including design defects, bugs, delays, fitness for purpose, etc.

Featured IT, technology and telecoms cases


  • Advised a large NHS Trust on defending a claim (alleged to be worth over £600,000) by a company providing television and telephone services to patients at wards.

  • Drafted a defence in a claim for delays to the development of a bespoke CRM system; issues included variation of timescales and prevention of contractor’s performance by the employer.

  • Instructed unled for a web development firm in respect of a claim for fees and a counterclaim for alleged failures in developing a website for a private cosmetic surgery clinic.

  • Advised on a claim in respect of a defective broadband and telephone system.

  • Drafted a defence in a claim under a contract to supply and configure servers for a law firm.

  • Drafted particulars of claim for the subcontractor against the M&E contractor under a JCT contract for the supply and installation of a system of audio-visual equipment in a retirement development of 100+ flats (successfully settled after service of the pleading).

Kajetan has experience of a broad range of professional negligence claims (both on the claimant and defendant side), including in particular claims against lawyers and financial professionals, but also construction professionals such as architects, engineers, valuers and surveyors.

Featured Professional negligence cases


  • Advised a firm of solicitors in connection with wide-ranging claims of professional negligence and breach of fiduciary duty in respect of conduct of litigation.

  • Junior counsel for the engineering consultants in TCC litigation against a client in respect of BIM design of MEP services on a Falkland Islands military base (£1.7m claim for fees, professional negligence counterclaim alleged to be worth over £5m; settled following a successful partial summary judgment application limiting any counterclaim to £500,000).

  • Second junior counsel in a nine-figure ICC arbitration concerning a negligent concept design.

  • Instructed (as devil) for the claimants in a claim against a firm of solicitors in respect of negligently damaging their clients’ credit rating (satisfactory settlement obtained).

  • Acted for an architect in a multi-defendant claim alleging (as against the architect) defects in the technical aspects of the design of a residential home.

  • In pupillage, assisted with a €16m claim against a Gibraltar barrister in respect of alleged professional negligence in the conduct of a claim against a major bank.

James Watthey and Kajetan Wandowicz called to the Bar of the British Virgin Islands

We are delighted to announce that James Watthey and Kajetan Wandowicz have been called to the Bar of the British Virgin...

Kajetan Wandowicz recognised in The Lawyer Hot 100 2024

We are pleased to hear that Kajetan Wandowicz has been recognised in The Lawyer Hot 100 2024. The Lawyer Hot 100...

Kajetan Wandowicz successful in XXX v Persons Unknown [2022] EWHC 2776 (KB)

Kajetan Wandowicz, instructed by Weightmans LLP, appeared on behalf of the successful claimant before Cavanagh J in...

Kajetan Wandowicz successful in an important case for the law of mistake ‘Longley v PPB Entertainment Limited & Ors [2022] EWHC 977...

Mrs Justice Ellenbogen has handed down her judgment in Longley v PPB Entertainment Limited & Ors [2022] EWHC 977...

Instruct Kajetan

To instruct Kajetan please contact our clerks on +44 (0)20 7842 5522 or email [email protected].

  • Called to the BVI bar
  • Judicial Assistant, Commercial Court (Hilary term 2021)
  • Lincoln’s Inn: Lord Denning Scholarship; Hardwicke Award; Wigglesworth Scholarship; Buchanan Prize
  • Academic prizes – law: GDL runner-up, Bar Council Law Reform Committee Essay Competition; Geoff Douglas prize for criminal law (UWE)
  • Academic prizes – non-law: Chancellor’s prize for the best MA dissertation in Social Sciences (Univ. of Wroclaw); Chancellor’s scholarship for research achievements (Univ. of Wroclaw); Mayor of Wroclaw scholarship for city’s best students
  • Mooting: Individual runner-up, St John’s Chambers Mooting Competition; Individual winner, UWE mooting championships
  • COMBAR
  • TECBAR
  • LCLCBA
  • PNBA
  • Young Maritime Professionals
  • Advocate (Bar Pro Bono Unit)
  • Keble College Advanced International Advocacy Course
  • BPTC, University of the West of England, outstanding
  • GDL, University of the West of England, distinction, top of year in every module
  • MA, Philosophy, University of Wroclaw and University Paris 8, distinction-equivalent
  • BA, Philosophy, University of Wroclaw, first class-equivalent, graduated in 2 years
  • Bilingual Polish
  • Good French and Spanish
  • Basic Russian, German and Mandarin

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