If you haven’t already been diverted by the history of John Gilpin, or would like to venture that way again, you couldn’t find a better accompaniment than the drawings of Ronald Searle. The BFI commissioned four films from Halas & Bactchelor to be screened in the “Telekinema” for the Festival of Britain. Pitched as an experiment in combining verse with illustrations, this fourth and last edition was the only one that contained a single work, with plenty of room to breath.