Boris Johnson is to warn that it would be "intolerable and undemocratic" for EU laws and regulations to be imposed on Britain after it leaves the European Union.

In a major Brexit speech in central London on Wednesday, the Foreign Secretary will say that the benefits of membership of the Single Market and Customs Union are "nothing like as conspicuous or irrefutable" as is claimed by pro-Europeans.

He will warn that failing to "take back control of our laws" will make it impossible for Britain to strike free trade deals and "exploit the changes in the world economy".

His comments come amid Cabinet splits over how far Britain should diverge from the European Union, with Mr Johnson and other senior Eurosceptics making the case for a clean Brexit.

Philip Hammond, the Chancellor, and other members of the Cabinet who backed Remain want Britain to be closely aligned to the EU after Brexit in a bid to limit the economic risk.