The majority of Britons are descended from the Spanish.

Peter   Sun Oct 29, 2006 4:34 pm GMT
Yes, they are the result of a melting pot, still about 70 per cent of all Britons come from Spain. In any case that is what said authors say, based on genetic research.
Peter   Sun Oct 29, 2006 4:48 pm GMT
Here you have more links:

In the first one you can actually see the proportion of different population groups. It was taken from the book Blood of the Isles, by Brien Sykes.