BBC News analysis by Laura Kuenssberg argues Prime Minister Andy Burnham has gone beyond the expected EU-UK deal to be signed at the Brussels summit on 20 November, floating a return to the EU as his long-term ambition despite warnings that rejoining means accepting freedom of movement and no à la carte single market access. Michel Barnier tells her the UK cannot pick and choose, Labour figures preach caution, and Kuenssberg expects no smooth ride, calling a rejoin campaign a heck of a gamble with enormous risks and possible rewards.