Tercarley
Do you also remember when you signed your contract that you were told that if you left early to join a competitor, then you would lose your concessions immediately.
I don't know why you think you have lost Hotline unless you have no friends among the serving or retired staff. All you have to do is ask them and then re-imburse them, since they must pay with their credit card.
What about SIA and the other flag carrier I think you said you worked for, don't they offer concessional travel?
I will lose my BA concessions when I'm 89, but I gave them my life and what fun it all was!