Several Labour MPs are in talks about defecting to the Greens, but are seeking guarantees they would be backed electorally by their new party, the Guardian has been told.
Zack Polanski, the leader of the Greens in England and Wales, has said publicly that he has chatted to Labour MPs about the idea of switching sides, with the leftwing party enjoying a surge in membership and having overtaken Labour in some recent opinion polls.
