Theresa May’s campaign to sell her Brexit deal to sceptical MPs and a divided country ran into further difficulties when a string of official economic forecasts concluded that the UK would be better off remaining in the European Union.

The Bank of England said on Wednesday that GDP would have been at least 1% higher in five years’ time if the UK had voted to remain, while an official Whitehall analysis concluded that in all Brexit scenarios, including May’s final deal, the UK would be worse off.