Yep, and their system was so screwed that they ended up having to vote for corrupt goon Jacques Chirac (disliked by everyone), or the NF were going to get in!Yes, but that was against a divided opposition - the french left was in a hell of state.
But the simple fact is that we've never had a GE under PR, so you have no idea what effect that will have. Disenfranchised voters everywhere would express themselves as they wished, no tactical nonsense.There is PR in the European elections and the BNP got nowhere near 10% and that was on a lower turnout - they'd get a smaller share at a General Election. The 2009 European election was also held when Labour and Gordon Brown were at their most unpopular, just after the expenses scandal broke: that won't apply at a future general election.