As for what a see as tradtions and culture etc; I belive that patriotism, flying the flag, celebrating our Country, helping out anyone in need, being polite, being well dressed, supporting British industry, sport, food, Christianity. There just a very small randomly selected one's that came into my head.
Patriotism: In a free society it shouldnt be mandatory to be patriotic, plenty of native British people would say they arent patriotic. why should they have to be, why should anyone else who settles here? Should those British people who live in Spain providing resources for British holidaymakers be patriotic to the Spanish what if they do want to be.
flying the flag/celebrating our Country: Is that really a tradition, I have only really ever seen anyone fly the flag during sporting tournaments and royal occasions, I have never known any non-native British person complain about this. Far from it, most foreigners love it. Why wouldnt they. Why would it be a problem if they didn't want to get involved, native British or non natives, what about freedom of choice?
helping out anyone in need: How often do you give to the homeless? offer a tramp in for a meal? I am willing to accept as a nation we are a pretty charitable lot. Im not sure this is a national trait. I think since Thatcher we as a nation have become rather self-centred and greedy.
being polite, being well dressed: You can see this and the opposite in all subcultures in the UK.
supporting British industry: The fact that people come here to work contributes towards our GDP thereby creating growth for our nation. Very often immigrants create businesses and forge very successful partnerships with their native lands, creating export growth, and importing goods at cost effective price margins.
sport: Most immigrant cultures are involved in sport, some more involved in some sports than others, looking around a football ground and youll see people of all persuasions. The asians love cricket far more than the Brits.
Food: As I said above we have a much more interesting choice of food available to us now, I dont think many people would want to limit our diet through a nationalist dogma.
Christianity: Difficult one, but given this country's crusade against the different christian sects over the years, I think thats more trouble than its worth.