I mean yeah I'm sure that Python and the other things have paved the way for a greater understanding of the British sense of humor but I don't think it's all that different than the American sense of humor.
They don't make you pay for the humor. It's up and down but they're trying to give you as many laughs as possible in 2 minutes. They are the most honest comedians ever.
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A good actor is someone who knows how to take the part and make it real and make it honest and be effective in it. If it's in a funny movie and as long as they are cast in an appropriate way humor will come from it.