Between 1936 and 1966, ten camps were built, including one in Ireland and one in The Bahamas. In the 1970s and 1980s Butlins also operated numerous large hotels including one in Spain, a number of smaller holiday parks in England and France, and a revolving restaurant in the Post Office Tower in London.
Tough competition from overseas package holiday operators, rising operational costs, and rapidly changing demand forced many of these to close in the 1980s and 1990s. Three of the original camps remain open under the Butlins’ brand in Bognor Regis, Minehead and Skegness. They are now owned and run by Butlins Skyline Ltd a subsidiary company of Bourne Leisure Ltd which also operates other leisure brands in the UK including Warner Leisure Hotels and Haven Holidays.
Info gleaned from Wikipedia