Boris Johnson warns against 'bog roll Brexit' as pro-EU campaigners prepare to march

Research by the Centre for European Reform has shown Brexit has already made the UK economy 2.1% weaker than it would have been if voters had decided to stay in the EU.Data from similar economies, including Canada, Japan, Hungary and the US was used to estimate how the UK would have performed.

CER deputy director John Springford said: "Two years on from the referendum, we now know that the Brexit vote has seriously damaged the economy.

"And we know that the government's 'Brexit dividend' is a myth, the vote is costing the Treasury £440m a week, far more than the UK ever contributed to the EU budget."