I'm not convinced that can account for a large percentage of the electorate. Of course some people vote tactically, but there are also bound to be constituencies where people voted tactically for the Lib-Dems to keep another party out. Even if it doesn't even out, given that only about a third of the constituencies could be considered a close contest I find it difficult to see how it could account for a significant percentage of the vote.
oh, i'm not suggesting they'd've done massively better, but just suggesting there's a margin of error in your quoting exact shares of the vote, even ignoring labour's fairly recent "conversion".
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