I'm in Birmingham...we have herring gulls, black headed gulls and Greater black backed all over the place... we get odd lesser black backed and common gulls (which are not that common) and there have been a number of rarer ones on the many large reservoirs and lakes
We live about 60-70miles from the sea and most of the local ponds have a few gulls living on them, and the land fill,a few miles down the road has a huge colony