I think that what Rob is looking at is a depiction of the amplifiers for the Tannoy speaker system. It was split up into zones, eg Boat deck ,outside stbd. Engine room, Public Rooms etc etc. built into the SRE Room, at a date after launch the "studio" where the daily Radio Show eg came from This started around the center of the room and went over to the port side. it was only about4'-5' wide, had 2 chairs, a double record deck, 8 track player and a casette player.After re-engining I have no idea what went on there. Michael it would have to have been part of the telephone exchange, although it was in existence in 1971.