just come across this thread - very interesting.
Giving up seats - no, never. Someone gave me a seat on the Paris metro last month and in Barcelona a few months earlier. But not on the tube in London - except for a couple of times, both by people of Asian appearance.
Queuing, though, is still done much more in the UK than abroad. And the British sense of humour is still different from most (NZers get it but Australians mostly don't).
Jake, surely the national dish these days is not so much fish and chips as curry? As far as I know it was brought back by people who'd been to work for the raj, but it has really boomed under the influence of Asians in Britain.
More broadly, though, UK culture has become very globalised. American language, Japanese cars, continental-style football mania, and a me-me-me attitude that seems to have been largely locally grown.