In reply to @FryRsquared
@FryRsquared @AdamRutherford That caveat about people with family trees from outside the UK is putting pretty massive load on the word "we" in the title.
In reply to @christianp
@FryRsquared @AdamRutherford how much more info would you need to estimate the proportion of all humans descended from Edward III? Is that in the book?