The All-Party Parliamentary Group (APPG) on Investment Fraud and Fairer Financial Services has called for an independent investigation into the Financial Conduct Authority’s treatment of whistleblowers following the death of former banker Simon Andriesz.

Andriesz, 57, died in September after years of raising concerns about alleged financial misconduct at his former employer, BGC Group.

His disclosures contributed to regulatory action in the United States, including financial penalties, while HM Revenue & Customs subsequently pursued substantial tax liabilities.

However, Andriesz repeatedly criticised the FCA, alleging that it failed to investigate his concerns adequately or protect him from retaliation.

The regulator previously acknowledged incorrectly advising him that he had lost whistleblower protection because his identity had become known. It subsequently apologised.

APPG chairman John McDonnell MP described Andriesz’s death as a profound tragedy, arguing that serious questions remained about the regulator’s handling of his case.

The FCA has commissioned a review led by newly appointed board member Lea Paterson, but parliamentarians have questioned whether an internal investigation can provide sufficient independence.

The APPG has indicated that it could conduct its own evidence-gathering exercise if necessary.

The case has renewed parliamentary scrutiny of whistleblower protections and regulatory accountability across Britain’s financial services sector.