Thanks for your prompt responses, deeceethree and Human Factor.
Apparently, the "Association of Flight Attendants" is a trade union in its own right, and has no connection with the nascent PCC(C). According to its website
Association of Flight Attendants UK it has 632 members.
My question is whether the "Association of Flight Attendants" has any members working for BA and, if so, what part they are playing in the current industrial dispute.