I haven't been there for over 20 years but isn't there even a sign at the junction saying: << 03L ?
or a sign on M saying 'Geen Nigels'
There but for the grace etc and, yes, I do appreciate that BA is not one of the more popular targets on Prune and would agree that, had it been one of those, they'd be getting even more stick.
Last flew that one in '91.