Gareth Ansell

Gareth has broad experience in complex commercial disputes having acted on a number of high-value cross-border disputes for corporate clients and high net worth individuals.

Gareth also acts for international and national level athletes in anti-doping proceedings, working with and against governing bodies in the UK and abroad.

Experience

The Public Institution for Social Security v Al Wazzan (as representative of Al Rajaan) & Others

LK acted for four of 45 defendants in a c. US$1 billion international fraud claim brought in the Commercial Court by the Kuwaiti State pension fund, The Public Institution for Social Security (PIFSS). The claim centres on allegations of long-running schemes to make and conceal corrupt payments, including alleged secret commissions paid to PIFSS’ most senior officer over a period of two decades. The matter raises complex, multi-jurisdictional issues requiring detailed consideration of Kuwaiti, Swiss and English law. The proceedings were recognised among The Lawyer’s “Top 20 Cases” in both 2020 and 2025 and remain one of the most substantial pieces of litigation ever brought before the Commercial Court, with a 12-month trial concluding in March 2026.

UHNWI – Breach of fiduciary & contractual duties

Acting for an UHNWI in relation to actions against an investment advisor and private bank for breach of fiduciary and contractual duties under various investment advisory and loan agreements. The client invested approximately £500m in various funds on the investment advisor’s advice and now wishes to unwind the investments because of the advisor’s conduct. The case includes allegations about the misapplication of client monies, inappropriate investment strategies and fund arrangements, breach of fiduciary duties, conflicts of interest and general breaches of the FCA Conduct of Business Rules and Principles.

UHNWI – Breach of fiduciary & contractual duties (part 20)

LK acts for an ultra-high net worth individual in relation to a Part 20 claim for contribution to a complex and high value commercial court claim for unlawful dissipation and devaluation of the main claimants’ assets.

LK has been instructed by the client in relation to a long-running dispute against his former investment advisor and private bank, most significantly in Cayman proceedings against the investment advisor for breach of fiduciary and contractual duties under various investment advisory and loan agreements.

UHNWI – Investment and supply of services agreements

Acting as Co-counsel for an UHNWI in relation to an LCIA arbitration, defending claims brought by their former wealth-managers under certain investment and supply of services agreements and advancing counterclaims for fraudulent misrepresentation and conspiracy.

UHNWI – Agency agreement

Acting for our client and his mother in an LCIA arbitration brought by a BVI company in connection with work allegedly carried out under an agency agreement to assist in the recovery of two high-end leasehold properties in London.

CE Line One Corp

Advising a high net worth individual and their company in relation to a fraudulent investment scheme. Including in relation to 1782 discovery obtained in the USA, working with the SRA in relation to the lawyers involved in the transactions resulting in a positive enforcement action and advising the client in relation to proceedings in England and Wales to recover the funds invested.