British software engineer Lewis Barber has filed a lawsuit against HDR Global Trading Limited, the operator of BitMEX, seeking the return of 324.8 Bitcoin or equivalent damages valued at £20.4 million as of October 1. The claim specifically targets 1,053 losing perpetual swap trades executed between 2018 and 2022 across five accounts, while leaving other transactions untouched. Barber argues that BitMEX conducted these regulated activities in the UK without necessary authorization, invoking Section 26 of the Financial Services and Markets Act 2000 to demand restitution. Although the Financial Conduct Authority issued a warning in March 2020 regarding BitMEX’s potential unauthorized status, it did not confirm violations for specific trades. The court must still determine if the statutory provision applies and whether enforcing the agreement is just and equitable under Section 28. Meanwhile, legal firm Seladore Legal is assessing interest from other former UK-based BitMEX clients for potential claims.