"Because of the ridiculousness of “First Past The Post” any vote for a minority party would be wasted. So I never got to vote Labour. Instead, I read the Lib Dem and Conservative manifesto and picked the LibDems."

On that, also, any vote that loses is effectively wasted under FPTP. Afterwards, if you picked a loser, you might as well ave picked any of the others.

With regard to upcoming stuff, surely it's better to vote for someone who will rule out a programme of cooperation with the Tories? Otherwise you vote against them just to keep them in.