I did the 146 production several times during open days which I think usually coincided with the PFA Fly In at Cranfield, 1983 and 1984 certainly and probably on several later occasions. Recall a Guppy doing a low pass (and a Fred Olsen Electra coincidentally flying over out of Heathrow!) as well plus the DH-88 displaying as it was based there - it eventually got slightly bent when it ground-looped at one of these events, cue another rebuild!
Somewhat ashamed that my colleagues were involved in designing the de Havilland Campus which consumed the hallowed site a couple of decades ago, but such is the price of progress...