This sickens me

Many ethnic groups, and nationalised Britons choose to identify themselves through their ancestral culture, so why shouldn't I? *

You mean like the welsh british the cornish british or the scots british, not to mention some yorskshiremen to whom being British or english takes second place.
So where does that leave your "darkies" comment?

Though you hit the nail on the head with

The colour of their skin has no bearing on their behaviour, bad or otherwise.

The only people skin colour is an issue for are those that have wierd problems with peoples skin colour ...like the person who brought it into this topic.
So hows about celebrating the british monoculture with a cold german lager and a chicken tikka masala as it don't get more British than that