HOW TO fill half an hour of early evening Channel 4 telly quickly and cheaply: take two teams of reasonably erudite celebrities (WILLIE RUSHTON, GRAEME GARDEN, GYLES BRANDRETH, CHRISTOPHER BIGGINS, RULA LENSKA, SHIELA STEAFAL, BARRY CRYER, MELVYN BRAGG etc.), some hastily-concocted word games (e.g. names of counties hidden in monologues), and hey presto! Instant employment for PETER PURVES as quizmaster. It couldn’t fail…or could it? Much of the badinage seemed to be read off cue cards, which dulled the verbal to-and-fro a tad. Even JOANNA LUMLEY managed to memorise her little bit of spiel on CALL MY BLUFF, for God’s sake!