Ah! I think I see where some misunderstanding may be occurring about what I said in the OP. My feeling is that if four fifths of the consituency's electorate vote for a candidate, however selected, to be their MP, then to deselect (that is, by my understanding, remove) then that is undemocratic.
I know PLPs normally select candidates. I've been involved in that process in the past. But what I argued here is that if the electorate want a particular person as their MP, as their representative in parliament, then that is a more powerful and more pure use of democracy.
While I am not expecting many people to agree with this viewpoint, it would be nice to think it was understood, at least by some, even if they disagree.
I'm arguing, as usual, about an idea, not a person. I don't care what Berger is like. If the electorate wants her to represent them, then I think that, democratically, they should have her represent them.
The actions of whoever got her to be the candidate for Liverpool Wavertree would seem to suggest that they thought that too.