British humour, much like American humour is mostly specific to our own people. From what I have seen, humour is restricted to the English speaking world, the rest dont really have it. Of course, it may be that I only speak English.
I told this to some Europeans, 'Someone stole my anti-depressants. I just hope they are happy'. They thought I was serious. Mind you, I have a lot of fun with the Germans. They get none of my jokes, which I find funny in itself.
I actually wrote jokes for a very short time. Thats true. Got a few quid for each one, but stopped. Like writing for magazines its not worth the effort for the money.