"We have to make sure we are diligent about what we are doing but also see it through."Benedict Brogan, not to mention Bernard Jenkin MP, about Mr Cameron's choice of next May 5 for the referendum on the AV?electoral system.?It is of course possible that the Prime Minister?had not worked out for himself that as in Scotland and Wales there will be Assembly elections in which?PR is used as well as local elections, but in England there will be local elections only, there will be a differential turnout, favouring a "yes" vote.?It is hard to think he is that stupid - or, if he was, that no one would have explained it all to him.