With regards to the Electoral Reform Society in particular, no they don't argue for list PR.
https://www.electoral-reform.org.uk/campaigns/electoral-reform/
"We want to see the Single Transferable Vote, a fairer, more proportional voting system that makes seats match votes"
Well they're unified in regards to all having been shit...
I agree with your post above incidentally, the important issue should be making more votes count and encouraging a more constructive approach to politics in general and in the Commons. Not just "this'll screw the Tories".
The Electoral Reform society don't argue for a list PR system (almost nobody does, it's only politicians who don't want to risk direct accountability who think that's a good idea).
Given FPTP elections over the last few years have given us a Conservative majority (based on 35% of the vote) which...
Where are you getting UKIP having 80 seats in 2005 from?
They only got 2.2% of the vote that election. Which under a directly proportional system would lead to 14 seats and under an STV system might give them a couple from wherever that vote happens to be most concentrated.
I assume you mean...
This is literally the opposite of anything that Labour or any even vaguely centrist-left of centre party should be suggesting.
It's the sort of policy where if Labour came out with it I'd be like "maybe the Conservatives will turn it around, I think they deserve another chance".
Well the worst thing UKIP getting people elected could have led to is us leaving the EU.
Thank god that never happened because we had FPTP to protect us from all the nutters.