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Parliamentary Voting System and Constituencies Bill

Is not one of the problems with their lordships' threshold that it invalidates only one of the options—the alternative vote system? If the referendum turnout was under the threshold, both the first-past-the-post and AV options should, in fairness, be invalidated—if indeed we accept the principle of a threshold, which we should not. If we do accept it, either result should be invalidated in such circumstances.