This film seems to work extremely well for most viewers, "Marvellous" and "delightful" seem to be the default epithets. Therefore, maybe you should trust their opinion, rather than mine. Especially if you feel perfectly happy to spend (a little more than) two hours watching a good-looking retro film, which never aims at anything loftier or brainier than triggering a few laughs and smiles.
On the other side, even with this limited yardstick, be warned if like myself you are rather demanding about the comedies you really enjoy. Not only is the humor here pure slapstick - it is fairly predictable and unoriginal slapstick, relying primarily on heavy-going national stereotypes and on unsubtle visual gags. As to the plot (a race...), it is wafer-thin.
What this film really misses, from my viewpoint - apart from Ronald Searle's wonderful drawings for the opening and end titles - would be a heavy pinch of salt and pepper, of Lewis Carroll nonsense and Monty Python absurd.