WHO MIGHT JOIN THE REMAINERS?

Tories: Anna Soubry (former Business Minister), Ken Clarke (former Chancellor), George Osborne (former Chancellor, right) and James Chapman (former Chief of Staff to David Davis). Labour: Chuka Umunna (former Shadow Business Secretary), Chris Leslie (ex-Shadow Chancellor), David Miliband (former Foreign Secretary) and Ben Bradshaw (former Culture Secretary).

Lib Dems: Vince Cable (party leader, ex-Business Secretary) and Nick Clegg (former Deputy PM).