THOUGH Bagehot is a hand-wringing liberal on many subjects, when it comes to dodgy public art (taxpayer funded or no) he is a raving conservative. One of the less happy surprises of returning to London after a long stint abroad has been the discovery, street by street, of 13 years‘ worth of duff installations. So I cheered a piece in the latest Spectator by Richard Dorment, art critic of the Daily Telegraph, denouncing the grim collection of sculptured tat dumped in recent years on Park Lane, a short stretch of dual carriageway bolted on to the eastern edge of Hyde Park by crazed 1960s urban planners.