Change the electoral rules so that the parties candidates belong to cannot be shown on ballot papers nor on any electoral publicity.

That way we would get a Parliament consisting of members elected on their individual manifestos rather than dictated by a party.

Creeky, that very same thing was covered in an episode of Yes Prime Minister about 25 years ago

Professor Marriott explains that under his scheme local MP's become genuinely independent. Their re-election will depend on the people and not on the backing of the local party. This will mean the end of the power of the party machine and the party whips