Orange Tree theatre, London Comedy's upper-class antics are transposed to 1920s Bath and bring a crowd-pleasing mix of anarchic spirit and silliness, though it slackens occasionally Richard Brinsley Sheridan's comedy is a perfect revival for the festive period for its crowd-pleasing mix of anarchic spirit, silliness and Sheridan's own panto dame in the word-mangling Mrs Malaprop. Tom Littler's 250th anniversary produ…