The Foreign Secretary said he intends to "plough ahead" after a leaked letter revealed Dr Fox, the International Trade Secretary, effectively called for the Foreign Office to be broken up.

It comes after The Telegraph revealed earlier that Dr Fox had sent a letter to Mr Johnson warning him that British trade with other countries will not "flourish" if responsibility for future policy rests with the Foreign Office.

Mrs May was "unimpressed" with Dr Fox's behaviour and sources said she wants her ministers to "stop wasting time" and instead focus on delivering Brexit.