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Parliamentary Voting System and Constituencies Bill

Does my hon. Friend not recognise that there is a difference between an ordinary election and constitutional change? A common feature of many constitutions is having thresholds for constitutional change. Just because we have an unwritten constitution, that does not mean that we are absolved of any responsibility to show that there is a reasonable threshold for constitutional change. If there were only a 10% turnout in London, where there are no forthcoming local elections, would that really constitute a valid result?