Kind Hearts and Coronets has been mentioned already (albeit in passing) but I must nod at it again. Easily the funniest of the Ealing comedies. I also love Captain's Holiday, which admittedly was not an Ealing film but does feature Alec Guinness.
More recently, I'll give the nod to Thank You For Smoking. That was a hilarious movie.
More recently, I'll give the nod to Thank You For Smoking. That was a hilarious movie.