Leader Ed Davey to call for talks to begin immediately, urging ministers to be ‘far more positive, far more ambitious’

The Liberal Democrats are to call for the government to seek a formal customs union with the EU to boost growth and insulate the UK from the impacts of a Trump presidency, a move that will place new pressure on Keir Starmer over Europe.

The changed Lib Dem stance – the party’s election manifesto argued only for closer links with Europe – will be made by its leader, Ed Davey, in a speech in London on Thursday.