Sustainability. Has there ever been a word so beloved of a government? What makes its over-use just so extraordinary is that almost no-one in the Labour administration seems to be able to provide a decent definition.This situation reached new heights of absurdity last week when arch Tony-crony Lord Falconer described the future make-up of the House of Lords as 'sustainable'. Quite what he meant is almost anyone's guess. Perhaps sustainable, like Lord Falconer himself, is a synonym for 'unelected'. On the other hand, perhaps he's been hanging out with too many ODPM ministers, who have an astonishing capacity for dropping it into every sentence, along with all the other over-used and misunderstood clichés such as 'the importance of good design'.