British banker Simon Andriesz helped to expose alleged ties between late sex offender Jeffrey Epstein and US commerce secretary Howard Lutnick

A top UK regulator has launched an investigation into how it handled a whistleblower – who highlighted alleged ties between the late sex offender Jeffrey Epstein and the US commerce secretary, Howard Lutnick – after he took his own life.

The British banker Simon Andriesz died late last month aged 57, the campaign group Transparency Task Force, of which he was a member, confirmed over the weekend.