"As an aside, many of the French-Canadians have English ancestry due to captives taken from to New England to Quebec. Many stayed and intermarried with the French, often changing names and losing links with their English ancestry. (Given the young age of some of these captives it is no wonder that they could not accurately report/remember original names)."
Most items that I have read indicate that the ethnicity is further back but there appears to be some inconsistency in responses concerning the time period for the ethnicity.
The difficulty is that if you go further back it makes it even more challenging to end up with 100% British Isles. Where could my family have lived that we had no contact with absolutely any other ethnicity for hundreds of years.
By the way TV and Radio speaker Sean Hannity is also 100% British Isles if I heard him correctly.