Instruct Katy

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

Katy Handley is a junior tenant at 4 Pump Court with a broad commercial law practice, focusing on technical disputes, and experience in both litigation and international arbitration.

Katy has been instructed as sole counsel in a variety of construction, technology, and professional negligence claims in both the County Court and the TCC and has experience as first junior counsel in arbitrations under LMAA, LCIA and DIAC rules. Clients have described her as “well prepared, clear and methodical” and “able to cope well with the unexpected”.

Katy’s experience includes:

  • Construction, Engineering and Energy
  • Commercial Litigation
  • International Arbitration
  • Technology & Telecoms disputes
  • Professional Negligence
  • Financial Services, Banking and Insurance
  • Shipping

Katy is regularly instructed as sole counsel to draft pleadings and appear in construction matters in the TCC. She has experience in cladding disputes and in-depth knowledge of the implications of the Building Safety Act 2022. In the 4 Pump Court Construction Newsletter, Katy has provided an update on key changes brought in by this act. She is currently co-writing a chapter on recent developments in building safety legislation for the latest edition of the Architects Legal Handbook and has provided various talks on the developments brought in this act and associated regulations to developers, contractors and housing associations.

Featured Construction cases


Instructed to advise on limitation and draft particulars of claim for the lead contractor in a multi-million-pound final account dispute arising out of the construction of a bakery (led by Simon Hale)


Instructed by a supplier and manufacturer of stadium seating to assist in settlement negotiations and advise on limitation in relation to a claim brought by a commercial customer for defective goods


Instructed to plead a claim in a circa. £17 million cladding dispute (led by Matthew Thorne )


Instructed in numerous cases in respect of various remediation orders and remediation contribution order proceedings in the FTT in relation to cladding defects pursuant to new DPA 1972 provisions introduced by the BSA 2023 (led by Alex Hickey KC and/or Jennie Gillies)


Instructed to draft a response in an adjudication brought by a the main contractor of a hospital construction project against the mechanical and electrical engineer in relation to alleged defects in the heating and cooling system (led by Tom Crangle)


Instructed to draft a Reply in a claim for breach of profit-sharing agreement by a property developer against the owner of the property


Instructed to advise on whether limitation had expired in a claim assigned by a piling works contractor following liquidation against customers under a JCT contract


Instructed as sole counsel to draft a Defence and advise on expert evidence in a claim for alleged negligent construction of residential properties pleaded at £500k


Acted as sole counsel for the award enforcer in an adjudication enforcement hearing concerning costs and interest in the Technology & Construction Court


Instructed to draft a Defence to a claim brought against an architect for defective design of a residential property, considering in particular issues of limitation and causation


Advised on liability, causation, limitation and quantum in the context of a claim against installers of a potential claim arising out of the negligent installation of a defective tap


Instructed to draft the Defence and Part 8 RFI in the context of a claim brought for breach of contract and under section 1 of the Defective Premises Act 1972 against contractors, for allegedly defective brickwork, and also asked to advise on limitation issues and the reasonable range of settlement


Instructed to draft Particulars of Claim for unpaid sums of circa £60k owed as payment for various building works undertaken by the Claimant at the Defendant’s residence


Instructed as sole counsel to draft pleadings in a construction project financing dispute worth circa £200k

Katy has experience in complex commercial disputes, in both litigation and arbitration, often with an international flavour. She regularly assists with service-out and substituted service applications, advises on the application of the Hague Service Convention post-Brexit, and advises on issues of governing law and jurisdiction in international contracts. She has provided talks, with Stephen Cogley KC and Laurence Page, on the main issues surrounding service in and service out in the context of actions in fraud.

Featured Commercial Litigation cases


Advised on matters of jurisdiction, governing law, and potential allegations of fraud in the context of an international services contract with a “schizophrenic” jurisdiction clause (led by Simon Davenport KC)


Regularly instructed to appear in CMCs and CCMCs in complex and higher value commercial disputes


Advised a leading aviation insurance provider on commencing arbitration in the UK against an airline based in Estonia


Regularly instructed to advise on and assist in drafting applications seeking permission to serve out of the jurisdiction, substituted service and extension for the period of service of a claim form (particularly in cases with multiple defendants)


Instructed as sole counsel to draft necessary documents for an application seeking an order for extension of time for service, and substituted service


Instructed as sole counsel for the Respondent in an application to vary a judgment debt order, disputing the application on the grounds of lack of cogent evidence supporting the applicant’s proposed payment plan


Instructed as sole counsel to draft the Reply and Defence to Counterclaim, and subsequently to appear at the CCMC and final hearing, in respect of a claim for rebates agreed in the context of a contract for the provision of heat installation units


Instructed as sole counsel to advice on and draft particulars of claim (both in contract and in negligence) against a manufacturer and supplier under a hire contract of a defective lorry engine which caused the vehicle to explode whilst in use


Instructed on a highly confidential government matter concerning a multi-million-pound procurement contract

 Katy has been instructed as junior counsel in a number of large-scale arbitrations and is developing a strong practice in this area.

Featured International Arbitration cases


Acting for the insurer of a Scandinavian film production company to defend a claim under a cast insurance policy in a London seated ad hoc arbitration (led by James Purchas)


Acting for an employer in a Dubai seated DIAC arbitration relating to a large-scale construction dispute in the UAE, raising issues of both delay and defects (led by Sanjay Patel KC)


Acting for Chinese head owners in a LCIA arbitration seated in London seeking an anti-suit injunction to restrain proceedings brought by Singaporean voyage charterers in Kenya claim for damages arising out of the wrongful arrest of a Vessel (led by Alexander Wright KC)


Instructed to advise on the appointment of an arbitrator through Part 8 proceedings


Worked on an arbitration where the claimants as time charterers sought a preliminary award for reimbursement of overpaid hire amounting to nearly US$300,000 from the owners under a NYPE 1946 time charter


Worked on an arbitration concerning the sale of a ship under Saleform 2012 terms for $70,000,000.

Katy has experience in Chambers’ leading IT work, including assisting in high-value and complex software disputes, and advising, as sole counsel, on quantum in GDPR claims. Prior to coming to the Bar, Katy worked for an online career networking platform as an IT support specialist and also assisted the in-house legal team with GDPR compliance and privacy policy updates. She is regularly instructed to defend GDPR and consumer claims brought against large international tech companies.

Featured Technology & Telecoms cases


Instructed by Post Office Limited to assist with the public inquiry into the implementation and failures of the Horizon IT system


Regularly instructed by a large tech company in defending various consumer, GDPR and data breach claims, in particular concerning the “right to be forgotten” under UK GDPR


Instructed, as junior counsel to Matthew Lavy KC and Gideon Shirazi on a large-scale international software dispute in which claims are brought for both misrepresentation and various breaches of a master services agreement


Instructed as sole counsel in a hearing in the Upper Lands Tribunal considering whether expert evidence was required to resolve a valuation dispute under the Electronic Communications Code between a national mobile network operator and the owner of a site where electronic communications apparatus was installed


Assisted with submissions to the Court of Appeal in CISGL v IBM [2022] EWCA Civ 440, by conducting research on the meaning of “wasted expenditure” in commonwealth authorities


Assisted with advising travel meta search engines on the legality of “screen scraping” flight data from commercial airline websites, considering the potential infringement of “Database Rights” under the Copyright and Rights in Databases Regulations 1997


Assisted with drafting a Request for Further Information in an ongoing dispute involving a multi-national technology corporation against various parties alleged to have reversed engineered the claimant’s software in breach of a license agreement


Assisted with advising on whether the sale of a “know-how” pack to participants of a proposed class action against a major software provider, in return for a share of the proceeds, would be unenforceable as a “damages-based agreement” under section 47C(8) of the Competition Act 1998


Instructed to advise on limitation issues, and the reasonable range of settlement for a claim arising out of a data breach according to developing case law since Gulati v MGN Ltd [2015] EWCA Civ 1291and Lloyd v Google [2021] UKSC 50

Katy has experience in a broad range of professional negligence claims, particularly claims brought against building contractors, surveyors, and engineers.

Featured Professional Negligence cases


Instructed as sole counsel to draft an amended defence and attend application hearings, seeking to rely on expert evidence and amend the defence, in proceedings brought against a surveyor based on alleged undetected defects in a residential property


Regularly instructed, as sole counsel to draft a defence and/or at trial to defend allegedly negligent housing surveyors (particularly those covered by RICS standards) against a claim by a purchaser of a property for losses arising out of the alleged failure to identify defects in a property prior to purchase


Instructed as sole counsel for the Claimant to draft pleadings and attend trial in a claim for negligence by a contractor in the context of domestic renovation works


Instructed as sole counsel to defend a claim brought against a drain surveyor for alleged failure to detect a faulty septic tank


Instructed as sole counsel at trial to defend a company against a claim by a customer for losses arising out of alleged defects with the fencing


Assisted with disclosure for a multi-million-pound claim in respect of the alleged negligent auditing of accounts


Assisted in responding to a potential claim brought against consultant construction engineers by a developer for damages resulting from an allegedly negligent failure to achieve an earthworks balance and minimise surplus soil

Katy is regularly instructed to advise and act by banks, particularly in the context of AML regulations and consumer credit agreements. She also has experience acting for insured parties and assisting leading insurers and insurance brokers within the UK market.

Featured Financial Services, Banking and Insurance cases


Instructed by a major high street bank in an application to strike out a claim seeking damages for breach of the Equality Act 2010


Instructed as sole counsel for the defendant in a claim against major bank for losses incurred by the bank withholding the claimant’s money, where the bank’s defence was reasonable suspicion of money laundering and fraud on the part of the claimant


Advised on whether a loan agreement to fund construction work on a residential property was rendered unenforceable by the Financial Services and Markets Act 2000 or the Consumer Credit Act 1974


Assisted with compliance with wide-ranging Norwich Pharmacal and Banker’s Trust Orders by the Royal Court of Jersey in the context of alleged breach of fiduciary duties


Advised in conference on the reasonable range of settlement and the likely award in respect of an agreement rendered unenforceable by section 26 of FSMA 2000, but enforced by discretion under section 28 of that Act


Appeared as sole counsel in an application to set aside default judgment made by a Bank in a claim for direct debit refunds


Instructed, on numerous occasions, to represent petitioning creditors in winding up proceedings

Katy is regularly instructed in admiralty proceedings and to draft pleadings in complex shipping disputes, often with an international element.

Featured Shipping and International Trade cases


Instructed to advise on the prospects of success in a potential claim brought by a shipowner against the surveyor for negligent pre-purchase valuation of a vessel


Instructed with Alexander Wright KC to advise on the construction of Clause 1 of the Shelltime 4 form


Instructed as sole counsel to defend a marina against claims brought by the owners of a vessel for, inter alia, breach of the berthing agreement


Instructed draft an application for permission for service out substituted service, and extension of time for service, in the context of a claim for general average contributions against over 70 defendants in various jurisdiction (led by Alexander Wright KC)


Instructed to attend in rem proceedings in the Admiralty court to secure the arrest of a vessel as a result of unpaid berthing fees


Instructed as sole counsel to draft the Particulars of Claim in respect of a demurrage claim brought by the owner of a vessel against a charterer for fees of circa US$100,000, including allegations of misrepresentation


Instructed as sole counsel to draft pleadings in and attend hearings (including the winding up of a company) in the context of a dispute concerning the theft of goods pursuant to a CMR contract of carriage with losses in the sum of almost EUR500k, and involving the Third Party (Rights Against Insurers) Act 2010.

Featured Energy, Power & Utilities cases


Regularly instructed to draft Defences, and as sole counsel for the CCMC, on behalf of energy suppliers in claims brought by customers for alleged wrongful payment of commission to energy brokers


Assisted with advising on a potential claim under Article 1, protocol 1 ECHR brought by various special purpose vehicle companies against Ofgem for damages resulting from Ofgem’s wrongful refusal to register the companies as producers under a renewable energy subsidy scheme

4 Pump Court at London International Disputes Week

4 Pump Court will once again be taking part in London International Disputes Week (LIDW) in June. Members look forward...

Dubai Arbitration Week 2023

Lynne McCafferty KC, Sanjay Patel, Daniel Churcher and Katy Handley will be in Dubai for Arbitration Week between...

Judgment handed down in an appeal which raised issues of wider importance for the QFC and Qatari law- Simon Hale

Simon Hale appeared on behalf of the defendant bank in an appeal against a first instance decision in the Civil and...

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...

Instruct Katy

To instruct Katy please contact our clerks on +44 (0)20 7842 5524 or email [email protected].

Buchannan Prize, Lincoln’s Inn

Lord Denning, Lord Bowen and Hardwicke Scholarships, Lincoln’s Inn

Career Commitment Scholarship, BPP University

Second Place in the Times Law Awards Essay Competition 2020, Title: “Taming the social media giants, how far should the state go in regulating online content?”

Honorary Mentions for Written and Oral Advocacy, Willem C Vis International Commercial Arbitration Moot 2019

The Commercial Bar Association

The Society for Computers & Law (SCL)

BA, English Literature, First Class, Durham University

BA, Law with Senior Status, University of Cambridge

LLM in Legal Practice, Distinction (85%), BPP University (Outstanding in BPTC modules)

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For help and advice talk to a member of our clerking team. They can advise on the best options for your matter.

Call: +44 (0) 20 7842 5555

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