I would have thought it you were over a certain age (say 35?), joining on a BARP pension living in the UK, then BA is not actually that good a gig. Coupled with the corporate culture and unique working relationship on board, I should imagine that opportunities in the M.E and the Far East would tempt somebody with few family ties.
I know that I will be telling my children to look East & West and try to stay out of the U.K. (Unless they get into banking or politics)