Britain and Wales don't have a lot of evidence for a Phoenician presence, but interestingly, some place names on the west of the island have Semitic names, and those places make sense as locations where Phoenicians would be allowed to land to trade for the tin but not allowed to venture inland. Most interesting is Echri Island in the Severn river. It's the most inland island in the river, making it the last island a ship would try to land on if forbidden to land in the mainland. And E-kh-R is the Semitic root for the word "last." (A-kha-ron in Hebrew.)

While I'm at this, it's no secret that coastal cities in Spain have Phoenician names: Barcelona, Malaga, Cartagena and Cadiz. Cadiz comes from "gader," meaning "boundary", and the Phoenician colonists there were charged with making sure nobody except Carthaginians would be allowed to sail west of there (and then on to Britain.)