Spain is homeland of British Celts

If the R1b3 grouping represents the Celts, they had to have been close ancestrial relatives to the R1b Haplogroup who were the indigenous peoples of Western Europe. Many authorities are in agreement that Spain and not other parts of Europe were the homeland of a large segment of the British Isles. This coincides with the Irish legends regarding the sons of King Milesius. But it doesn't answer the nagging question of an Indo-European language.

http://users.reachone.com/jfsmith/Origin.html