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Hendersons - Barristers' Chambers

Arnold Ayoo

“Arnold is a star in the making at the Bar” with “… gravitas in his advocacy”. "He leaves no stone unturned".

Legal 500 and Chambers UK (2022, 2023, 2024)


Arnold practices in heavy commercial litigation/arbitration and specialises in cases with an insolvency crossover. He also has particular expertise in group litigation, civil fraud and company law. He is ranked by the legal directories as a Leader in the Field (Commercial Dispute Resolution) and a Leading Junior (Company and Insolvency).

Arnold is comfortable at every level of the Court system. Recently, he acted successfully (unled) in a civil fraud case, involving a £2m worldwide freezing order (Argyle Rose Ltd v Naaz [2023] 3 WLUK 835); appeared in the Court of Appeal (unled) in the main case on the interpretation of the Corporate Insolvency & Governance Act 2020 (Doran & Anor v County Rentals Ltd [2022] EWCA Civ 137) and the Supreme Court in a landmark contract and unjust enrichment case (Barton v Gwyn Jones [2023] UKSC 3).

In 2024 Arnold is instructed, as sole counsel on three significant Commercial Court actions (a $60m conspiracy claim brought by an African oil company; a £20m claim to enforce an expert SPA determination; and a £3m commission claim brought by an investment bank). He is also led on two group actions: acting for a German manufacturer in the Dieselgate litigation and for the claimants in a £400m secret commission claim.

Arnold has a thriving civil fraud practice and is an injunction specialist. In 2023, he has (unled) obtained three worldwide freezing orders (including proprietary injunctions), three breach of confidence injunctions and he continues to act in committal proceedings.

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Arnold has extensive experience in heavy commercial litigation, often appearing in cases with an international element. He is ranked as a leader in this field (C&P 2024).
His practice covers the spectrum of claims arising from commercial business arrangements, especially where fraud is at issue. Ranked as a leading junior in company law (Legal 500 2024), he also acts in partnership and shareholder disputes, including unfair prejudice petitions and derivative actions.
Arnold regularly brings and defends interim applications for injunctions and freezing orders.

Representative cases

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  • Barton v Gwyn-Jones [2023] UKSC 3

    Led by Brad Pomfret, acting for the respondent, in a generationally important appeal on contract/unjust enrichment before the Supreme Court. It concerned the contractual allocation of risk, implied terms, the sanctity of contracts principle, and the limits of unjust enrichment where a contract subsists.

  • Argyle Rose Ltd v Naaz [2023] 3 WLUK 835

    Civil fraud claim arising out of diversion of business profits by a business associate operating a secret shadow business. Arnold acted for the successful applicants in obtaining a WFO (£2m), proprietary injunctions (covering the proceeds from a diversion of business), permission to serve out of the jurisdiction and alternative service by WhatsApp.

  • Re SPA [2022] (Commercial Court)

    Acting (unled) for 8 claimants against 7 defendants in a £17m claim for deferred consideration following the expert determination of elements of an £90m SPA.

  • AC v BG: [2021] (Commercial Court)

    Currently instructed as sole counsel for the Claimant in a £3m commission claim. C is the assignee of a debt owing to an investment bank, who claims to have brokered a $50m investment in a South African gold mining company and seeks commission, as per a contract.

  • AR & Ors v Loizou [2022] (Chancery Division)

    Represented a lateral testing business, alleging that D fraudulently hacked their websites/email accounts and manipulated software to divert online payments to his own bank account. Cs claimed a fraudulent breach of confidence, passing off, various economic torts and damages (est over £1m). Arnold successfully obtained interim injunctions (before Johnson J and James Pickering QC as a Deputy HCJ) to return the websites to Cs control and prevent further breaches of confidence.

  • Points of View Ltd v Erre DB Group SA [2021] 2 WLUK 70

    Acted (unled) and obtained a £400,000 judgment for the claimant against a Swiss developer in a cross-border construction dispute, arising from the construction of the flagship Flannels store on Oxford Street.


Arnold is recognised by the Legal 500 as a Leading Junior in this field (Tier 2). He has a breath of experience in insolvency and restructuring proceedings, and is at home in complex, contested disputes. His practice covers contentious and non-contentious, personal and corporate insolvency and restructuring – including administrations, voluntary arrangements, liquidations, bankruptcy and claims under the Insolvency Act 1986, especially wrongful and fraudulent trading, misfeasance, preferences, transactions at an undervalue and transactions to defraud creditors.

He has written for Lexis Nexis on insolvency and restructuring law and has contributed LexisPSL case updates on cases of importance in which he has been involved. In late 2021, he appeared in a landmark appeal in the High Court concerning the interpretation of the coronavirus test under the Corporate Insolvency and Governance Act 2020.

Arnold also advises on the non-contentious aspects of restructuring which have the capacity to develop into disputes. For example, much of his 2020 post-covid practice was advising multi-national retailers on CVAs which restructured rent obligations following the demise of the high street.

Representative cases

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  • Doran v County Rentals Limited [2022] EWCA Civ 137

    Appeared (unled) for the appellant petitioner in a landmark appeal concerning the interaction between insolvency and coronavirus. It concerned whether a company can rely on coronavirus to defeat a winding up petition in respect of sums which fell due pre-pandemic but not formally demanded until after the pandemic.

  • O v D [2022] (Commercial Court)

    Acting (unled) for the liquidator of a Bermudan information and communications technology company, together with 6 other claimants, in a €20m claim to recover sums due following the sale of an arm of its business.

  • Reputation Exchange PLC v Paneleven [2022] EWHC 3627 (Ch)

    Appeared for the respondent in an injunction to prevent the presentation of a winding up petition. The judgment concerned the proper standard of proof in substantial dispute allegations, cross-claims and counterclaims.

  • LW v C & others [2022] (ChD)

    Currently acting (unled) in a £4m claim under s.423 of the Insolvency Act 1986 (intention to defraud creditors). The claimant avers that the third defendant, whom Arnold represents, conspired with D1/D2 to sell commercial developments at massive undervalues, depriving the claimant of the true value of its security.

  • Wolf Rock (Cornwall) Limited v Langhelle [2021] B.C.C. 67

    Successfully acted (unled) for the petitioner at trial and appeal. At trial, Arnold obtained a compulsory winding up order and resisted attempts to bring cross claims of £7m. At appeal, HHJ Matthews decided key questions on insolvency procedure and the jurisdiction to make a winding up order where the sum is ‘unliquidated’ or concerns damages. It appears in Sealy & Milman 24th Ed (2021) in the commentary to both IR 7.16 and s.124(1) Insolvency Act 1986.

  • Doran v County Rentals Limited [2021] EWHC 3478 (Ch)

    Appeared (unled) for the appellant petitioner in a landmark appeal concerning the interaction between insolvency and coronavirus. It concerned whether a company can rely on coronavirus to defeat a winding up petition in respect of sums which fell due pre-pandemic but not formally demanded until after the pandemic. The judgment examines the circumstances when an inference of insolvency can be drawn from the fact of non-payment.


After graduating from Oxford in 2012, and before coming to the Bar, Arnold set up a business providing a consultancy service to young sports professionals. He focussed on the critical analysis of financial and legal documents so as to protect the interests of vulnerable athletes, including under-21 Premiership and youth international football players.

This background in advising sportspeople has seen him develop an interest in commercial cases with sports elements as well as more specialised disputes. As such, his current practice also reflects his interest in the intersection between sports law, commercial litigation and insolvency.

His non-contentious experience includes:

  • advising on and drafting the relevant documentation for a £6m sale of shares in a Championship football club;
  • advising the majority shareholder of a Championship football club on the sale of £5.5m shares to a consortium.

Representative cases

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  • Castleford Tigers v Solomona & Sale Sharks [2017]

    Acted (unled) for Castleford Tigers in a £500,000 Rugby League/Union litigation concerning the disputed transfer of England International Denny Solomona to Sale Sharks;



  • G50 Holdings & Lemos v Bernard [2017] (ChD)

    Represented (unled) the owner of a Football League club who sought an injunction to restrain a sale of the club by a co-owner who had allegedly defrauded him out of his majority stake.

  • Capstone Sports Management v Opare [2018]

    Multi-day £300,000 dispute between a Sports Management Company and a Bundesliga player concerning breach of contract/undue influence.

  • Re Premiership Football Club (kit supplier)

    Advised a Premiership football club on potential claims arising out of a £4m dispute with their main kit supplier/sponsor due to the late supply of kits at the commencement of the season.

  • Re Premiership Football Club (pre-season camp)

    Advised a Premiership football club in a cross-border breach of contract dispute against the organisers of a pre-season training camp in Germany.

Consumer Claims

Arnold has had significant experience in dealing with various causes of action in the consumer context, namely: fraudulent misrepresentation/deceit, breach of contact, unfair relationships and claims pursuant to the Consumer Protection from Unfair Trading Regs 2008. His experience is both generally and specifically within technical claims against car manufacturers/sellers.

Vehicle manufacturers/vendors

For 7 years, Arnold has been retained by a number of banks to act on the defendant side where misrepresentation and BoC claims are raised, by consumers against dealerships, arising from the purchase of cars financed by his clients. The claims involve:

  • Technical arguments about the specific defects (not of satisfactory quality);
  • Fraudulent misrepresentation/deceit claims against the dealerships/salespeople, often pertaining to the written advertising materials;
  • Unfair relationships that relate to the finance agreements.

In 2021, Arnold acted for a super car dealership in a multi-day TCC claim arising out of the sale of defective Bentleys. It was a technical matter concerning latent electrical defects and conformity to the contract.


Generally Arnold has been involved in:

  • Defending numerous fraudulent misrepresentation claims by consumers against timeshare providers, often also engaging unfair relationships (related to the finance agreement used to purchase the timeshares).
  • Defending, through to trial, 50+ claims brought by consumers against an EU timeshare termination service. The claims specifically involved the Part 4A CPUT 2008 redress relating to misleading actions (regulation 5) and aggressive practices (regulation 7) and covered unwinding, damages and discounts.

Group Litigation

Arnold readily accepts instructions in large group litigation cases. He has experience of complex and high value commercial group actions.

Representative cases

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  • Re Energy Tarrifs / Secret Commissions [2021]

    Currently advising 3000 business customers on ‘secret commission’ claims against energy companies arising out of the non-disclosure of payments to energy brokers. Should it proceed, the value of claims would top £90m.

  • Terrcorp Limited v Mistry & ors (2020) EWHC 2623 (Ch)

    Acted in a claim brought against 174 defendants by land-owning companies who claimed payments under various covenants after the sale of green field sites to the defendant buyers. Arnold advised and acted for a category of representative defendants prior to trial.

  • Peel Land & Property (Ports) Ltd v Nawaz & ors [2017-18]

    Acting for a group of sub leaseholders and lenders with interests in 75 apartments seeking relief from forfeiture further to the forfeiture of an intermediate lease. Total value of client property at stake in excess of £3m.

  • AB v CD (2018)

    Advising a group of high-profile cricket, rugby, football and television personalities in a £300,000 claim for professional negligence against former solicitors who had represented them in a dispute concerning tax avoidance schemes linked to the film industry.

Commercial & Sport Arbitration

Arnold acts in large, international commercial arbitrations as well as smaller, domestic ad-hoc matters and sports disputes.

Representative cases

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  • AZ v UL [2023] (ICC - London Seat)

    Currently acting in ICC arbitration between an Eastern European government owned oil company (for whom Arnold acted, as sole counsel) and its pipeline supplier in a breach of contract, unjust enrichment, and breach of trust claim.

  • SO v IP [2020] (ICC - London Seat)

    An $6m ICC arbitration between a government appointed oil exploration company (for whom Arnold acted, as sole counsel) and its production sharing partner. The breach of contract case involved the interpretation of interlinking production sharing, joint operating, and farmout agreements between an African State, the oil exploration company and its relevant partners.

  • Corekci v Cramer [2018] (Football Association Rule K/ Commercial Court)

    Successfully acted for a football agent in a FA Rule K arbitration, in respect of agency fees, against a top-flight Turkish footballer. The unsuccessful player then applied to the Commercial Court under s.67/68 Arbitration Act 1996 to set aside the arbitral award, in proceedings heard before Moulder J and Knowles J.

  • Thornley v Hull KR [2017] (RFL Independent Tribunal)

    Represented an RFL player against his former club before an arbitral tribunal after a disputed transfer from Hull KR to Catalan Dragons.

Banking, Finance & Financial Services

Arnold acts for and against financial institutions in matters arising from the execution and enforcement of loan agreements, financial instruments, charges/other security and guarantees. He frequently acts for lenders in relation to disputes about commercial loans and sees such instructions through to the enforcement stage (including disputes about property and insolvency).

He is also retained by the consumer lending divisions of numerous major financial institutions – so is well versed in the spectrum of consumer credit/unfair relationship matters and s.75 Consumer Credit Act 1974 claims based on misrepresentation.


What the directories say

"Arnold Ayoo is keen to get stuck in and help with discussions."
Chambers UK 2024

"Arnold is always ready for a challenge and leaves no stone unturned."
Chambers UK 2024

“He is very enthusiastic, very thoughtful and approachable.”
Chambers UK 2023

“Arnold takes a practical approach to cases.”
Chambers UK 2023

“Arnold is very personable. He is also extremely knowledgeable and a safe pair of hands.”
Chambers UK 2023

Instructing Arnold Ayoo

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BA Law (Jurisprudence), University of Oxford, Christ Church

BPTC, BPP (Very Competent)

Regulatory Information

All members of Chambers are registered with the Bar Standards Board of England and Wales. For our standard contractual terms click here.

For more information about the way barristers at Henderson Chambers work, including our fee transparency statement and our complaints process, please click here.

Bar Council Number: 62921

VAT Registration Number: 208315041

Legal Status: Barrister

Professional Insurance: All members of Chambers have professional liability insurance provided by the Bar Mutual Indemnity Fund Ltd. Territorial coverage is world-wide and subject to the term of the Bar Mutual. Click here for details.

Regulated by the Bar Standards Board.

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