BEA and BOAC were different entities to BA and what airline would fly a plane about that didn’t display to the world their current incarnation? (all other retro schemes dispaly the current name of the airline)
BA did have a B747 classic in BOAC livery for a very very very short time in the late 90’s I believe.
I’d love to see a B777 in BOAC livery. An A320 in BEA livery with red wings would also look good I think.
or just bring back the landor livery!