"British culture" was destroyed long before immigrants arrived on her shores. The moment Britons took the momentous descision to leave their safe and sheltered shores, to go around he world learning and contributing to civilizaton, her 'indigenous' culture was doomed.
To anyone who has read even a spot of History, one would understand that immigration has not destroyed British culture, the Empire did that first.
However, I am certainly concerned with certain aspects of British culutre that are being erroded. I have always seen British culture as openess, tolerance, and above all patriotic. Britain is a multi-cultural society, whether one would admit it or not. Scots, Welsh, and Englishmen from various regions have all shared and contributed to one anothers communities while peacefully coexisting. All of these groups have been strongly patriotic and proud of their mutual identity.
What troubles me, though, is the fact that many incomming groups do not display these feelings. While many immigrants, and their descendants, are just as British in patriotism and identity as anyone else, I see many immigrant groups segregating themselves from the mainstream, seeking to impose their views and norms on all other groups, all while looking down their noses at Britain and her inhabitants.
That is my daily rave on this issue, so you may or disagree, but this is simply the way I view the issue.