Downing Street reportedly considered involving the police over the leaking of a letter from Rupert Soames, chief executive officer of outsourcing company Serco, to the Prime Minister.

David Cameron is facing intense pressure from within Tory ranks over "shocking" claims he misled parliament following a "stitch-up" with big business over EU referendum campaigning.

In a leaked letter from February, seen by the Daily Mail, at a time when Mr Cameron said he would “rule nothing out” if he did not secure his desired changes - the head of a multi-national company raises the idea of “how to mobilise corporates” about the risks of leaving the EU.