[Oliver_W]

The content of the o.p. on its own is a bit meaningless, and "many" isn't quantified - I'm sure "many" people are constantly leaving and joining the main two parties.

But I know what it means, and the shine has come off Corbyn a bit - during the snap election period he seemed (to some) to be a credible PM candidate, especially when they thought he was a remainer. But he's since settled down to somewhere admittedly above the joke he was before the GE, but the Corbyn Train has run out of coal.