The RTF was pronounced 'BEELINE/BEETOURS'. The Airlines were BEA-British European Airways, and later, the charter division. British European Airways Airtours, (BEA Airtours), operating ex-BEA Comets and ex-BOAC B707-436's.
It may have been written as BEATOURS, but phontically was pronounced 'BEE-TOURS'.
This extended up to the time of the B737 accident at EGCC, and maybe beyond that event.