It's obvious, isn't it? If Colin Firth, fresh from his success at the BAFTAs, says that the Alternative Vote is the way to go, then I'm bound to follow suit. I mean, he knows all about politics and psephology. (Admittedly, he once favoured Nick Clegg; but I'm sure that was just an unfortunate blip.)
And now he has been joined by his co-star, Helena Bonham Carter. If AV is good enough for a double-barrelled luvvie, it must be good enough for simple old me.