I dont know about f block being haunted but I was stationed at Wentworth Barracks 1969/72, with 4 div Pro Unit which occupied B block.
I was on nights in the duty room. Early morning, weather calm and warm. One of the lads came in a bit worse the wear for Herforder and went upstairs to his room. After a while i heard the sound of a window banging. It being a calm night I thought that the lad who had just come in was playing up. I checked him and he was in bed fast asleep. a walk round the outside of the block, No windows flapping in the non existant wind. The sound stopped and a short time later I heard what seemed to be someone with a wooden leg!! walking along the corridor dragging something. I was sure this was a wind up and shot upstairs to the accommodation corridor. No one there and no sound. The hairs were really prickling by this time
It only happened the once and I think i was long enough in service not to have been set-up.
On another Occasion I was asleep in my room. early hours again when my room door burst open and two friends on mine ran in, both white as a sheet. They were from hammersmith Bks and had come over to see if the mess was open.
The story goes that finding the mess shut, they heard someone playing snooker in the snooker room. On looking in, the balls were moving, but the room was empty. They were adamant and refused to go back to hammersmith till daylight