FPTP has benefited the two main parties for generations, but it’s breaking down, at the last election their combined share of the vote was the smallest ever. It mostly benefited the Tories, but most people vote centre left. With PR we would get a Parliament that reflects how we vote. Good or bad.

there is no route to get PR in the UK. Major political change is usually forced by revolution or war - witness the mad US constitution which will not change either