Trying to trace a novel

Published around 1980/81. May have been called "The Island" or similar. Author not known. Publisher not known. Plot: Britain is taken over by Communists from Ireland. There leader was called Bull, I recall.

Can anyone help?
 
There was a book called Revolution Island, by Julian Fane, which had a fascist takeover of the UK - and then an invasion of Ireland, which became the home of the regime's concentration and death camps.

The Fascist leader was, IIRC, named Bull - his followers naturally known as The Bullyboys.
 
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