Every year will see one po-faced carol converted line-by-line into festive silliness, filth and fun, the kind of bawdy humour that puts the bang into a Christmas cracker. Imagine them as seasonal alternatives to Roald Dahl’s brilliantly iconoclastic Revolting Rhymes; each packaged as small, full-colour hardbacks and each designed to tweak the noses of those who take their Christmases far too seriously.