I heard the hangar that houses the Lincoln bomber at Cosford has a resident ghost. Folk have claimed to have seen a figure sitting in the cockpit and one engineer was apparently given some (good) verbal advice whilst trying to fix something on the aircraft. Strangely, no-one was there when he turned round and no-one had been near him at all.
I heard a radio program some years back about an investigation which took place one night by a group who sat in the Lincoln aircraft. These folks reportedly experienced strange pinpricks of light floating about in the aircraft and heard strange clicking noises which were later traced to be the same as the magneto switches being operated.