Some 'Barn' related folklore for you.
Before the re-engining the Staff Capt and Chief off didn't have offices there, the barn was the entire space from port - starboard behind the chartroom. It was where the 'logging and flogging' took place, ie discipline handed out to errant crew as required, most mornings at sea around 10am. As this area had access to the bridge it had to be secure and a Security PO manned the door to the bridge and barn. You had to knock to get in.
These duties were replaced by a camera and TV salvaged from one of the Baggage X-ray machines by myself and Brian Martin and was given the title 'C-Through PO' (This was shortly after Star Wars had come out!) Door release by a button on the bridge by the TV monitor on the forward port side of the wheelhouse. The radar transceivers were in the barn as were some of VHF radio units. The space between the Wheelhouse and the Chartroom was a walk-in electrical junction box with thousands of cables. The tiny staircase shown on that drawing at frame 243-1/2 went from the bridge up to the monkey island so what was generally not appreciated was that you could easily access the bridge by walking over the penthouse roofs, across a narrow walkway either side of the signal mast and onto the Monkey Island then straight down to the bridge as the small door at the top of that staircase was not lockable! This I did on many occasions as a short-cut to the surprise of the Officer on Watch who had not let me in with 'C-Through PO'. Custodian of the barn was - in my day - the excellent Quartermaster John O'Keefe expert at ships knots and a very competent golfer. One of his tricks was to throw a rope on the floor and pick it up as a 'bowline' knot with one hand.
Frame 241 starboard side is shown a small room on that diagram, this was the Captains Sea Cabin, a bunk where the Capt could sleep in fog with rapid access to the bridge.
