Where the hall balcony used to be prior to 1969. It finished on a line between the two pillars: The one on the left - adj the red chair, and right - the one now with a green Fire exit sign on it.
At the BACK: Left hand side - an archway leads to either the corridor or room 14a??. MIDDLE - (door in wooden panelling) - leads into the small room 15a with sink. RIGHT - door leads to room 16. Looking at this photo, I'm not sure that the plan is drawn correctly.