With so long since selection ... who knows how many may actually take up an offer after waiting so long?
Well you could just ask them!
The guys at selection stated that they made no apology for the toughness and thoroughness of the selection day because once a pilot joins BA there is no further interview towards command, just a wait in a long queue. If the "command interview" is valid for 20 years, why not for 18 months +1 day?
I know, not my train set...