hissinsid;
did they all fly the same or did the crews know that each airframe had her own foibles?
The answer is that they were remarkably similar in handling, I guess this is a function of the flight control system. Certainly the 747-100s and 200s I flew before Conc had a definite change of 'feel' from hull to hull. (The 777s don't).
They all had certain other 'foibles', although none were of any note operationally. I believe that AF's habit of generating ADS master warnings at M1 has been prevously covered, as has AG's 'French' DC system. There were certainly some hulls you'd rather have than others on the LHR-BGI sector, although I think I flew them all there at some point or another.
As for Filton - it's always sad to see an airfield close, but especially so when there's so much history attached. It would be great to see the runway remain active, but the costs are pretty steep and the value of the land rather high. I wish all thise involved the very best of luck and hope you succeed in at least turning the hangar into something which recognises its own history and gives it a real purpose for the future.