Theresa May will begin drawing up Britain’s blueprint for Brexit this week, with her cabinet split over the terms of European Union withdraw­al.

Senior Tories say Philip Hammond, the chancellor, is resisting plans by other ministers to pull out of the EU single market.

A Whitehall turf war has broken out, with the Treasury muscling in on Brexit negotiations — to the irritation of David Davis and Liam Fox, the ministers appointed to lead the planning.

The prime minister hosts a cabinet away day at Chequers on Wednesday, when planning for Brexit will be “top of the in tray”. She has ordered all cabinet ministers to report back on the best ways of “making a success” of leaving.

Hammond has privately insisted that “everything is