:::And as I've said before, to dispute the figures as published is POV and original research. For all you know they could be wrong the other way, and make B'ham even bigger. In short, we must rely on the official figures because that's what they are - official figures. If you average out their potential inaccuracies, it makes no sense to say that the figures for one or other of the conurbations is likely to be more wrong than the other one, so the result would still be the same - i.e. B'ham is bigger.