Have you read the Jenkins Commission report? It's as close to a detailed study of Electoral Systems as we have available to us, and despite the strengths of the AV system it mentions, it also saysand concludes (in relation to AV)It offers little prospect of a move towards greater proportionality, and in some circumstances, and those the ones which certainly prevailed at the last election and may well do so for at least the next one, it is even less proportional that FPTPThe emphasis is mine.The Commission's conclusions from these and other pieces of evidence about the operation of AV are threefold. First, it does not address one of our most important terms of reference. So far from doing much to relieve disproportionality, it is capable of substantially adding to it. Second, its effects (on its own without any corrective mechanism) are disturbingly unpredictable. Third, it would in the circumstances of the last election, which even if untypical is necessarily the one most vivid in the recollection of the public, and very likely in the circumstances of the next one too, be unacceptably unfair to the Conservatives. Fairness in representation is a complex concept, as we have seen in paragraph 6, and one to which the upholders of FPTP do not appear to attach great importance. But it is one which, apart from anything else, inhibits a Commission appointed by a Labour government and presided over by a Liberal Democrat from recommending a solution which at the last election might have left the Conservatives with less than half of their proportional entitlement. We therefore reject the AV as on its own a solution despite what many see as its very considerable advantage of ensuring that every constituency member gains majority acquiescence.