On the problems with Hampshire - my only related experience is that I had problems with POSTGIS unable to process a number of admin boundaries, because they are plotted with loops in the boundary. I.e. the boundary crosses over itself.
This mostly happened where the coast had been added to the relation ,and the coast was plotted at a very detailed level. Far too detailed to see on Potlatch. I solved it by getting POSTGIS to "simplify" the boundary, before doing the calculations. That effectively removed points that were nearer than about 1 metre apart, and seemed to get rid of the problem. At 1 metre distance I don't think it's losing any precision in the final result. I'm on a pretty steep learning curve here so it may not be the best way of doing it.
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