But it does not cover services, which make up 80% of the British economy, and trade in goods will still be hampered by red tape and higher costs.

Johnson, however, will say the deal resets Britain’s relationship with its neighbours, ending its “half-hearted” membership of the European club and instead becoming a sovereign equal able to do things differently.

“What we sought was not a rupture but a resolution, a resolution of the old and vexed question of Britain’s political relations with Europe, which bedevilled our post-War history.”

The deal, agreed more than four years after Britain narrowly voted to leave the bloc and as the clock ticked down on standstill arrangements, will open a new chapter, he will say.

The Brexit hardliners in Johnson’s party agreed on Tuesday to back the deal, in effect guaranteeing its endorsement just a day before transition arrangements expire.

It was already set to become law after the opposition Labour Party said it would vote in favour.