Parliamentary Voting System and Constituencies Bill

Can my hon. Friend answer clearly whether he believes the London system—which I have described as the London AV because that is how it was described by Professor Dunleavy—should be applied nationally and therefore should be put in the referendum, or does he believe the referendum choice should give people the chance to have both a supplementary AV system and his version of AV? If so, we could end up with two different forms of AV in this country's electoral system.