Denis Mollison has an article on Next Left about how STV would work in practice. He also shows off a map of how the UK could be divided up into multi-member constituencies.
I really like what Mollison has done here. He hasn’t simply drawn lines on the map but created constituencies based on local authority boundaries. Ironically this would mean that people would identify with parliamentary constituencies more than the largely artificial ones we currently use (if the Tories get their way and replace the current system for drawing boundaries with a more technocratic one based on number of voters, this problem will get even worse). His model would also result in 140 fewer MPs.
I’m sure there are decisions here and there that you could poke holes in; the London boundaries in particular are likely to prove controversial. But this is valuable work as it instantly changes the debate around STV from a very abstract one to one of practicalities.
And, fundamentally, it makes a pretty picture. Any chance of a hi-res version to put up on my wall?