i joined the labour party when Corbyn became prime minster.I have since left, i know of friends of mine who have also left they intend to vote green.
it is pure speculation as to whether Starmer will win an election , my guess[ and this too is speculation] is that the best that will be achieved is lab lib coalition, that there will be not one party that has an overall majority, and then the deal will be proprtional representation for the liberals.