Does every month of delay on Brexit cost £1bn?

The Conservatives have again referred to the contribution the UK makes to the EU. Claim Boris Johnson has said that “every month of delay [of Brexit] is costing this country £1bn to stay in right now”. Background This is a line that the Conservative party has used before. It was used by the foreign secretary, Dominic Raab, and refers to the total contribution the UK makes, roughly, to the EU every month. Reality Neither the figure nor the claim are accurate. A delay to ratifica