Originally Posted by
TheRiverCard
I can confirm that the lady is indeed correct.
According to
this and
this, you are only allowed to use the priority lane under two circumstances:
(1) You're holding a First Class ticket
(2) You're traveling with an airline that you hold a top membership with, for BA that would be Gold+. In this case, the cabin that you're taking does not matter. (Which slightly differs from Zeeww's interpretation)
Bizarre indeed.
Isn’t this exactly the rules for the First Wing with the exception of the lack of matching requirement?