One of Labour's most senior advisers is at the centre of a controversy after a private message which he accidentally posted publicly appeared to show him advising Michael Gove and the Brexit campaign.

Damian McBride, whose party's official position is to back the Remain campaign, posted the message: "V good! BTW, I'll email you another VAT-related idea this evening. Just in case there's a day/interview where MG is looking for a new line."

"MG" is thought to be the initials of Michael Gove, one of the most senior Conservatives campaigning for a Brexit vote in the EU referendum.