After PPI, the next most complained about products are current accounts, with 509,047 complaints and then credit cards with 314,586 complaints.
The PRA is a part of the Bank of England and responsible for the prudential regulation and supervision of banks, insurers and major investment firms, regulating some 1,700 financial firms.
The quartet are joined by Macfarlanes, Shoosmiths, Simmons & Simmons and Ward Hadaway, in a category designed to showcase the firms seeking new ways to provide legal services.
Mime Petroleum, an independent development and production company, was established by BWE and Sverre Skogen, chairman and CEO of Mime Petroleum.
Mr Mann said he would be chairing a “Treasury sub-committee inquiry into avoidance and evasion, aiming to unpick the failures of policy and resourcing that have allowed the tax base to be undermined”.