Which two British parties would be least likely to support changing to a proportional representation electoral system?

Name: Which two British parties would be least likely to support changing to a proportional representation electoral system?
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Question

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The Conservative and Labour parties have historically been less supportive of changing to a proportional representation electoral system, mainly because the current first-past-the-post system tends to benefit larger parties like themselves.

Which Two British Parties Would Be Least Likely to Support