Theresa May will announce that Britain is seeking a clean and hard Brexit in a speech this week that will promise to create a “strong new partnership” with the European Union.

The prime minister will finally lay her cards on the table, making clear that the UK is set to pull out of the single market and the European customs union in order to regain control of immigration and end the jurisdiction of the European Court of Justice.

A Downing Street source said last night that May had “gone for the full works”, although the prime minister’s staff admitted her words were likely to cause a “market correction” that could lead to a fresh fall in the pound.

In an effort to reassure voters who