Ed P in a comment below has reminded me what a good building the new Turner Gallery in Margate is; this is the N side of the cluster of simple concrete rectangles. Very simple, very beautiful, and the space inside is sumptuously pure and clean and divinely lit. By Sir David Chipperfield, who also designed the River & Rowing museum in Henley - another superb structure. Margate is substantially bigger than the dreadful Colchester mess. And at £17m about £11m cheaper.