I've been asked to teach an English course (hooray - programming gets boring sometimes) which includes a section on "British culture".
Obviously I could throw a few ideas together myself, but it is quite an interesting question and I'm sure I'd miss something.
Ideas so far:
dry, Self-depreciating humour
Dinner parties (the Spanish don't do them - they meet up in restaurants, kids and all, instead)
Fish and chips
Toad in the hole
Sticky toffee pudding
Christmas pudding
custard
Kids getting up at 5am christmas day (don't do that here either - me and dd were the only ones awake in the whole street at 8am last year)
pubs
pub quizzes
culturally adventurous (Rock n roll and hip hop only became mainstream in the US after they were in the UK. Don't know if that's because the US is culturally conservative or racist).
Shakespeare
tea
chocolate digestives
Branston (mmm Branston)
Stilton
....that's it so far. Can you tell I haven't had tea yet?
also as an aside, the students will be TV execs who want to be able to talk to their counterparts at British stations. What do TV execs talk about?