Twenty Lancashire councillors quit Labour in leadership protest

And that folks is how you keep the Tories in power.

Full Sugar Tory or Diet Tory.

One is definitely worse for your health.

Vote tactically and then harass the shit out of your MP to implement voting reform. Organise marches for voter reform.

That's the only way, short of armed revolution, you'll get any policies other than Blairite or Thatcherism into parliament.