Ultima Thule

The British are an easy going lot. When the Danes invaded, the ancient tribes just headed west and became the Welsh.
The hordes from Eastern lands, keep landing on these islands, so the Aborigines pack and move out - heading mostly sunwards. to Spain and the Mediterranean Islands.
Now any hope of return is fading. as the cheap flights have now ended.
All over the World, are pockets of Ancient (mostly) Britons. Having left their island home they have become the stangers in strange lands.
So in time, the Britons will cease to exist as a nation - only their DNA will be left!

Time Traveller