West Briton

noun2

1. •
   A person from the western part of Britain, a Welsh or Cornish person, especially (historical) the western Britons who resisted the 5th-century Anglo-Saxon invasion.
2. •
   (Ireland, offensive) An Irish person considered to be excessively Anglophile, an Irish person who acts English or desires to be part of British society.

   • —Well, I'm ashamed of you, said Miss Ivors frankly. To say you'd write for a rag like that. I didn't think you were a West Briton. — 1914