GB going it alone
Tandemrotor,
If GB were to suddenly pull out of the pool, they would become just another one of those dozens of holiday airlines going down south.
By staying with BA and its colors, it gives them respectability, codesharing with BA, and good connections from other incoming/outgoing BA flights.
How many passengers actually know that they are flying BG instead of BA? I believe most of the holidaymakers believe they are flying BA. They have not read the fine print.