[two134711]

Instead, a research team at Oxford University has found the majority of Britons are Celts descended from Spanish tribes who began arriving about 7,000 years ago.

7,000 years ago there was no "Spain," hence no Spanish tribes. Perhaps they meant Hispano-Celts, or Celtiberians. I know, it's nitpicking.

[Reily]

To all

Who did the Celts displace? I remember reading somewhere there were Celtic(Irish) folktales about conquering the "original inhabitants". There is some theorizing that the "Irish Travelers" are a remnant of the original inhabitants of the British Isles. When the Celtic tribes moved into Europe who did they displace, the Basques? I guarantee Europe wasn't empty!

[RegulatorCountry]

This dovetails quite nicely with the Milesian Legends.