As per a request on this site! I believe (?) this is a fictional livery....

British European Airways (BEA), formally British European Airways Corporation, was a British airline which existed from 1946 until 1974. BEA operated to Europe, North Africa and the Middle East from airports around the United Kingdom. The airline was also the largest UK domestic operator, serving major British cities, including London, Manchester, Glasgow, Edinburgh and Belfast, as well as areas of the British Isles such as the Highlands and Islands of Scotland, the Channel Islands and the Isle of Man. From 1946 until 1974, BEA operated a network of internal German routes between West Berlin and West Germany as well. The company slogan was Number One in Europe.

If you feel so inclinded, feel free to Buy Me a Coffee - https://buymeacoffee.com/ahsaul