West Briton

   Irish

   an Anglicized Irishman

   Often Protestant, educated in England, and affecting the speech and manners of the British professional classes. Used derogatively by some other Irish people:

    Those on the other side, he said, were mere 'West Britons'. (Kee, 1993 — this was rather rich coming from C. S. Parnell, a Protestant cricket-lover educated at Cambridge who spoke with a British upper-class accent)

   Whence the obsolete West Britonism, the policy of advocating the continuation of the union with Great Britain:

    The O'Conor Don is a sample of West Britonism in Ireland — he is a sample of the rights of England and Englishmen to rule Ireland, (ibid.)

   And the adjectival West British:

    After a short time the paper's policy could no longer with any justice be called 'West British'. (Fleming, 1965, of the Irish Times, which maintained a Unionist stance for some time after the creation of the Irish Free State)