Among the more unusual visitors: American Airlines MD-11s. I have a feeling these were flown from the factory to Marshalls at Cambridge for finishing off and avionics work which may have been cabin IFE. Whether their arrivals were too early for Cambridge to accept them, or whether they were clearing customs or whatever, they seemed to route via STN. I remember being parked on the ramp next to one early one morning. They had a short life with AA and I think got sold off to FedEx to become freighters. They're probably still landing at STN even now in 2020.
I believe that they were the aircraft originally destined for BCal. They are both still active, indeed one of them is due to land a STN in about 25 minutes time!