With the occasional Labour gov when they get a leader that is electable and the voters are so sick of years of Tory rule. Just look at the previous 50 years.
I'm a bit more optimistic that PR will get implemented eventually, at least the Tories have made a little progress on the voting front by equalising constituency sizes (despite doing it to get them more seats).
Do you think being in the EU would result in a significant libertarian social policies like the legalisation of drugs and sex work?
That picture is the exact opposite of reality though. The right had moved ever further to the right, the left hsve followed. The major left parties are now further right than the right wing parties of 20-30 years ago. The labour party have been especially bsd at trying to be ever so slightly less authoritarian than the Tories, essentially mirroring the Tory party from the previous election. It was only under Corbyn did they return to the center, yet somehow being politically central got thrm branded as Marxists on the British press.
Corbyn unfortunately attracted a large socialist/marxist/communist voter base with both the people running the Labour conference, the speakers and attendees referring to each other as "comrades" and demanding socialism.