The Daily Telegraph reports that Labour leader Sir Keir Starmer faces a revolt within his party over Brexit, after promising in a speech on Monday not to take the UK back into the single market or a customs union. The paper notes London Mayor Sadiq Khan openly contradicted his party’s leader by saying Britain should rejoin the EU single market as it would make the country’s future “more prosperous”. It reports Sir Keir’s position on Brexit puts Labour on a “collision course” with the Liberal Democrats whose aim is to rejoin the single market.