Tim Bale, Professor of Politics, has written for Politics.co.uk on why advocates of proportional representation must manage their expectations:
"Re-engineering the voting system in order to do down your opponent is, of course, by no means unusual. But it rarely works out quite as well as those who do the tinkering hope it will. Certainly, as others have noted, anyone who thinks PR will put an end to right-wing government in the UK should be careful what they wish for.
"Indeed, anyone who, like me, favours a move to a fairer voting system should probably dial down their expectations of how much things would change."
Politics.co.uk