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Most Western European countries (especially France) have significant hard-left communist parties alongside their larger, more moderate social-democratic or labour parties, typically taking 5-15% of the vote. Your challenge (with a POD after 1945) is to get the UK to have a similar party alongside moderate Labour, rather than in OTL Labour managing to keep a large part of the hard-left vote together with moderates. This communist party needs to be at least as significant as the Greens, BNP or UKIP are in the modern UK.
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