The majority of Britons are descended from the Spanish.

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.

Here you have more links:


http://thescotsman.scotsman.com/index.cfm?id=1393742006

http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=406108&in_page_id=1770&in_page_id=1770&expand=true#StartComments

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.