Bruno Iksil, the former trader at the centre of JP Morgan's London Whale scandal, is embroiled in a dispute with the Financial Conduct Authority about how the UK regulator handled its investigation into the case, it has emerged.

Iksil had complained to the FCA in August 2015 arguing it should have given him an opportunity to challenge a 2013 statement, or final notice, in which the FCA explained why it would be fining JP Morgan £137 million for "serious failings" after the bank’s $6.2 billion loss in 2012. On March 3, the FCA dismissed the complaint, according to Iksil, and now he plans to refer it to the Office of the Complaints Commissioner.