Irreverent: * showing lack of due respect or veneration; "irreverent scholars mocking sacred things"; "noisy irreverent tourists" -Princeton Dictionary.
This could be interpreted as our sort of cynical, sarcastic and occasionally vulgar humor. I must explore the kinds of things they need through a bit of research into humor that I feel has the qaulity of this definition.
A good example, and something to draw from visually is Monty python's flying circus, which is very British, very cynical and has a nice quirky absurdist qaulity which would be a good fit.
This was my initial thoughts, I'll post more when I'm less exhausted. time for bed.