David Cameron was elected Tory Party leader under a preferential voting system.

So why the tories are making such a big noise about how disastrous such a thing would be.

Is there an implication that that wasn't a disastrous outcome?

.....................

Still, in spite of this system having given us David Cameron, as well as the leaders of the various other political parties, it's a much better system than the only other one on offer, First Past the Post, which can give us MPs elected with a tiny proportion of the vote, and only one in three elected with the support of a majority of those voting.

I'm fed up being presented with the choice between "wasting my vote" by voting for the person I'd like to get in, who I've been told has little chance of getting in, or voting for somebody I don't particularly want, in order to prevent someone whose politics I detest sneaking in.

As for breaking promises made in manifestos, all parties do that regardless of whether they are in coalitions or not.

In fact AV would make it more possible for MPs who go along with that to be punished at the next election - when the Cleggite Lib-Dems stand for election next time, I am sure there will be anti-coalition Lib-Dems joining the line-up against them, and taking enough votes from them to send them to the bottom of the poll, so their vote gets redistributed in an hopefully more honest direction.