Basques

By far the majority of male gene types in the derive from Iberia (modern Spain and Portugal), ranging from a low of 59% in Fakenham, Norfolk to highs of 96% in Llangefni, north Wales and 93% Castlerea, Ireland. On average only 30% of gene types in England derive from north-west Europe. Even without dating the earlier waves of north-west European immigration, this invalidates the Anglo-Saxon wipeout theory... ...75-95% of British and Irelanders (genetic) matches derive from Iberia...Ireland, coastal Wales, and central and west-coast Scotland are almost entirely made up from Iberian founders, while the rest of the non-English parts of the Britain and Ireland have similarly high rates. England has rather lower rates of Iberian types with marked heterogeneity, but no English sample has less than 58% of Iberian samples...

In Rosser's work, the closest population to the Basques is in Cornwall, followed closely by Ireland, Scotland, Spain, Belgium, Portugal, East Anglia and then northern France.