Jeremy Corbyn under pressure to shift Labour policy on Brexit

Observer poll findsmajority of existing and potential voters back Britain remaining in single market and customs unionJeremy Corbyn is under huge pressure to shift party policy on Brexit as an exclusive poll for the Observer reveals a substantial majority of existing and potential Labour voters want him to back permanent membership of the EU’s single market and customs union.Four times as many Labour supporters favour that option as oppose it. The survey by Opinium also finds that more tha