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To be fair, he was Labour from 2006 to 2019 and left because he did not like Labour's direction under Corbyn. If he is pushing for Remain, he is trying to join whichever party is most likely to get there. There was a lot of talk about how remain voters were split across change UK, the greens, and lib dems. Joining the largest of the three to consolidate seems to make sense. The voting numbers from 2017 suggest that a careerist would try to stick it out at Labour.
"I'm not a careerist," says politician who switches parties twice in year to whichever one is most likely to advance his career.
Labour got c38,000 votes in Streatham in 2017, compared to the Lib Dems' c3,600.
A by-election would be an excellent way to show you are a committed representative, surely your constituents love you?