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PR would have made Lab-libdem (assuming they could meet somewhere in the middle, which we couldn't guarantee with Clegg) a bigger coalition. Depending on how the rules were, perhaps given the Tories had the bigger vote they'd have had the first chance to pull together a coalition. That said, they wouldn't have been able to beat the lab-dem outright as their vote share together was 52% and you can assume greens and other smaller parties would have been happy to pitch in to shut down a "Tory+UKIP+DUP+BNP (who got 2% of the vote)+other nutters" coalition for ever.
Hmm. Not convinced by this, think you need to show your reasoning. If we had PR in 2010 then the Tories would've formed a coalition with UKIP, not the LibDems, and you can guarantee that part of the agreement would've been a referendum on EU membership.