The PM’s preparations for a final deal are believed to be far more advanced than previously disclosed

Theresa May’s secret plan to secure a Brexit deal and win the backing of parliament can be revealed today.

Senior sources say the prime minister has secured private concessions from Brussels that will allow her to keep the whole of Britain in a customs union, avoiding a hard border in Northern Ireland. They expect this to placate remainer Tories and win over some Labour MPs.

And in a move that will appeal to Eurosceptics, May is also said to be on course to secure a political deal on a “future economic partnership” (FEP) with the European Union that will allow Britain to keep open the prospect of a free trade deal resembling that enjoyed by Canada.

The Sunday Times has been told that preparations for