The only British Airtours incident I am aware of at Stansted was in March either '84 or '85 when a Tristar on a training sortie left the taxiway paved surface while taxying out to runway 23 to start the training. The right main gear got stuck in the mud and it took a while to pull it out as it was heavy with fuel. . Apparently the captain was the same as the one on the B707 Prestwick incident a few years earlier. I've got some Kodacrome photo slides of it but don't have ability to convert to print photos to show on here.
Also Kondair Trislander G-BCCU in September 1986 operating a night Amsterdam - Stansted freight flight. The pilot fell asleep and the aircraft hit the sea damaging the undercarriage..