It is difficult to convey the scale of rapture - and of box-office revenue - created last Christmas by Nicholas Wright's dramatisation of Philip Pullman's His Dark Materials. With every performance sold out even before the press-night, the National Theatre decided to bring the show back for an even longer run next Christmas - playing right through from November to end April. Nicholas Wright has revisited his adaptation, tightening and improving it, and this revised version is to be published alongside the re-opening.