Two further rooms on the floors below the control room contained more equipment.
The first two pictures show the main distribution frame.
above left - The Uniselector Room contained the equipment that routed programme sources to destinations. The bays are being installed. above right - some of the programme uniselectors, showing the wiring.
left - a few of the uniselectors used in the main EMX (Engineering Manual Exchange). Above right - The room also contained bays of relays.