Unlike the eponymous "puffer", the "Maggie", this Ealing gem has a perfectly sound bottom. Something like a cross between Local Hero and The African Queen, it is better than both, for my money. The humour is delicious, but never overdone, the cast of skipper and crew just terrific, especially MacTaggart and the Wee Boy. Paul Douglas does the American tycoon just right -- not the send-up that these roles often are in such "clash of cultures" films, then and now. The locations are great to see and the local colour never looked more sparkling in black and white. A genuine sleeper.