Don't hesitate: this jolly little movie is pretty much impeccable.
An excellent script, which never falters. And a BOFFO cast of British actors. The quintessential role for Terry-Thomas (tho' "Magnificent Men" is a close second).
But also fine turns from Alistair Sim, John Le Mesurier, Hugh Paddick, Peter Jones. Hattie Jacques does an hilarious voice-parody of Joan Greenwood. Janette Scott is VERY good in a thankless "skirt" role; what a charming personality.
Old car fans will love this. The sport-cars and the mocked-up vintage "Swiftmobile" are worth the price of admission alone. (Sadly, the production designer / props chaps are as yet uncredited at IMDb: perhaps the information is lost.) Very nice camera-setups. Amusingly cheesy sets. A really excellent score from John Addison that is up to Georges Auric's standard.
This has a very jolly, intimate ambiance: a sense of small scale. Feels rather like the b&w Tati movies.
Ahem. Unlike many British comedies, I can really see the attraction of remaking this: the material is so damned good that it could use another go-round, without necessarily insulting the original.