It's dark humour in parts, but wonderfully funny. Strangely surreal sequences provide comic highlights as the film works towards a spectacular climax. As an undercurrent, the film characterises post-WWII attitudes of the English towards Continental Europe and the relationship between the UK and the US during the 50s/60s. But this just sets the scene for a very funny story.
Watch it, digest it for a while, then watch it again.
Watch it, digest it for a while, then watch it again.