Giddy: you keep saying that there is tactical voting in AV and there really, really isn't.
A party saying "just vote for us" is not increasing their chances at all. I suppose they can then say, if someone else wins, that they have won with a smaller proportion of the electorate, and maybe that is a reason to ask them to do it. But the voters who do that are really just disenfranchising themselves - abstaining from what is effectively a run off round.
AV is not PR and the very small parties will be unlikely to gain. However there may be a surprising number of people who would put, say, Green ahead of one of the large parties if they knew this vote wouldn't be wasted if green was eliminated. So it does give small parties a chance of growing.
As you have said earlier it will make no difference in seats where one party already gets 50% of the vote - although, again, it is possible that some of those people may put a smaller party first, knowing that they will not benefit any other party by splitting their preferred big party's vote.
All in all this thread (and the other) where I started out saying AV is better but not as important as increasing the chances of losing Clegg ... perhaps I have convinced myself to stick to my principles. After all I wouldn't want to end up like Clegg.......
can I just add as a dad and newbie how very impressed I am with the whole mumsnet talk thing. if only politicians conducted themselves in this way. Yes I know there is the odd rant / troll / etc but basically it feels quite grown up here unlike the house of commons