I have one story. I was at Swynnerton Camp abut 20 years ago with a group of guys doing the usual BFT, assault course vomit inducing, section attacks weekend kind of thing (yes it was reserves). We were kipping in one of the large underground bunkers and I was on stag from 0000 to 0200 Hrs. I was sat at the end of a concrete lined corridor - the bunkers were underground and were the old ammunition storage bunkers. The troop were asleep at the other end and I was sat on a chair in the middle of the corridor about 30 feet from the entrance and the lads were about 100 feet away. Lighting was low and dim and about 0140 Hrs I heard my relief coming - it was my mate Steve who was never early - you know the type - always needing to be dragged out of his grot. I looked down the corridor and saw a helmet, a rifle and webbing all in a silhouette. I stood up, put my webbing on, stretched and turned around and the corridor was empty. After a few seconds I ran down the corridor and Steve was still fast asleep in his bag, boots off, snoring away. Between the troop grot and me there was no where for anyone to have gone. It was very strange and I spent the next two hours on stag as well with Steve wondering whether it would reoccur. I mentioned it the next day and yep it happened occasionally but no one knew who or what this apparition was. I can still see him / it today very clearly in my head, Yes I was threaders tired but fully alert and on the ball. Very weird indeed.
U Boat, I´m sure that there is a virtually identical story to yours on an earlier page of this thread, and that it also took place at Swynnerton Camp. Either you have posted your story before and forgot, you´re re-telling an old dit, or you´re not the only one to have had that experience at Swynnerton.
There is at least one other ghost story from Swynnerton on this thread. I gathered that the place has a reputation for spooky occurrences.