# UK’s wealthiest financier Michael Platt sues own lawyer for professional negligence

- URL: https://talkfuse.com/story/uks-wealthiest-financier-michael-platt-sues-own-lawyer-for-professional-negligence/
- Published: 2026-11-06T15:15:59+00:00
- Updated: 2026-11-06T21:08:10+00:00
- Original publisher: City AM (publisher lean: Right)
- Original article: https://www.cityam.com/uks-wealthiest-financier-michael-platt-sues-own-lawyer-for-professional-negligence/
- Topics: Business, UK, World

## Key points

- Platt and BlueCrest are suing their former barrister over alleged negligence.
- The trial will examine advice on Swiss tax residency arguments.
- A separate ruling has left BlueCrest facing a near £200 million tax bill.

## Summary

Michael Platt and his hedge fund BlueCrest are suing their former barrister, Malcolm Gammie KC, for alleged professional negligence in a long-running tax dispute with HMRC. A forthcoming Commercial Court trial will consider whether Gammie should have advised them to use Swiss tax residency arguments, and whether not doing so cost them an opportunity to pursue a different case.

The dispute centres on BlueCrest’s partner incentive plan and how payments to senior traders and partners should be taxed. After courts ruled against BlueCrest’s arguments, the Court of Appeal criticised an analogy used by Gammie; the negligence claim will also examine whether bank and credit card statements from 17 years ago should be evidence. Separately, a Supreme Court ruling on LLP members’ tax status has left BlueCrest facing a tax bill of nearly £200 million and prompted concern across professional services.

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Summarised by TalkFuse (https://talkfuse.com/). Quote the original publisher for the reporting and link this page for the summary and discussion.