Yes they are.No they aren't.
The alternative is to accept that British only ever bred between themselves.
If you look back at the population of UK, say about 1200 AD, when the population of UK was about 3 million, then you'd probably be marrying your first cousin.
Assuming a generation is about 25 years, then going back to about 1500 AD, you would have had about 500,000 parents, grand parents, great grand parents, great great grand parents, etc, ad infinitum.
Going back to about 1400 AD, you would have had about 8million parents, grand parents, great grand parents, great great grand parents, etc.
So for the British to not have interbred with other nations, and of course France is the nearest, then there would have been an awful lot of incest going on.
It's just maths.
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