I meant to ask this earlier but only just remembered.

While we taxied out for takeoff at GOT last Friday (at around 17:30), a tiny (bizjet sized) twin-prop aircraft landed, in full BA livery (tail flag, "British Airways" written down the side). It didn't taxi to the terminal, but a bit of empty space off to one side. I didn't get a reg.
Any idea what it was? It's certainly not on the fleet page