jno makes a very good point.
Britain is one of the most mongrel nations on earth. Quite an achievement for an island.
For the last thousand years, we've mixed (and bred) with people who weren't born on the island. That's why some of us whites have blonde hair, some of us tan better than others and some are as ginger as you like.
In fact, if you really want to stand up for the rights of indigenous British people, you should probably leave the country if you're not ginger.
Choosing skin colour as the determining criterion is quite random. You'd be better off kicking out people with brown eyes.
"No," say the racists. "It's not the way they look, it's the way they try to change our culture." What, like building straight roads or eating curry on a friday night?
It just seems that the Little Englanders have conveniently set some arbitrary date - usually around the time that they were born - after which newcomers are unwanted and not indigenous. Hardly any of us are indigenous. Your ancestors were probably not that welcome when they pitched up and started breeding. But that's different is it?
Britain wouldn't be Britain if it wasn't so multicultural. I love it.