Someone said British people don't know what culture is, let alone British culture and another said 'Uk culture? please, what culture would the UK have if it wasn't for immigrants'.
I am from a non-Commonwealth, non-European refugee background and crap like this really gets my goat. Sometimes I really wish such people would go and live and work in another culture for a few years, just so that they would be forced to recognise how steeped in "British culture" they actually are.
Most of the time, people don't recognise "British culture" because they assume the values and beliefs they hold are universal; in fact, blindly assuming such values are universal could be said to be a mark of British culture. 
They should talk to international students who come to Britain to study about their experiences of culture shock.
But lets take it back to basics here. There are two definitions of culture broadly speaking: 1) the way a people live, think and behave, and 2) the best that a people have ever thought or said.
On both these markers, it is ludicrous to suggest that, say, Wales does not have a culture, or Scotland, or Norffolk or Cornwall, or Yorkshire, or London, and these cultures coalesce to create a "British culture" that is markedly different to the cultures of other countries and nationalities.
Take the first: the way a people live, think and behave. All you need to do is read AIBU for a few months to see British mentalities in action: from parking to noise to neighbours to attitudes about privacy, family, in-laws, pets, gift-giving and inheritance. In my DH's culture, again non-European, most of the subjects of these threads would be pretty unfathomable.
Again ... do you expect to make a personal payment to your local sub-postmaster before you can pick up an undelivered package? Do you expect to pay a regular amount to a non-civic entity if you run and operate a business? Do you expect a map of your area to be accurate and readable? Do you expect, when you start a job, to be given all the information you need to do that job? Do you expect to be able to speak for yourself and not have to be represented by a male elder, no matter your gender? Do you expect to be apply to apply for and get a job, based on your own merit, regardless of who your family and friends are? Do you expect law to be applied?
Of course you do. But what you have to recognise is that all of those are facets of the British way of doing things (ie. culture), and those expectations don't exist in other countries ... even in some European countries.
And then you look at the best that has ever been thought or said, and the whole notion that Britain has no culture is just laughable. Britain had a solid literary culture that constantly produces material and has done so for centuries. It is the same for music, art, clothing, architecture, ideas ... and Britain has had a scientific culture that punches, and has punched, way above its weight for years, considering the size of the British isles.
And this notion that racism is only practiced by "white" people? Where exactly does that leave the persecution of the Chinese by the Japanese? The persecution of non-Turkic ethnicities, many of whom would be seen as "white", under the Ottoman Empire?
Groupie's arguments are almost entirely based within a modern American paradigm that just does not travel.
Honestly ...