Peter, why not just use a contemporary dynamo lighting set. There were half a dozen makes on the market in 1948 or thereabouts including the Lucifer. Regarding James; they were better known to most people for their motorcycles. Post-war, they were Villiers engined lightweights but in the twenties they made exquisite little vee twin five hundreds. There is a Jean Thomann on eBay at present. Didn't they also make motorbikes? Stuart Tallack failing to keep completely on topic in springtime Sussex.