Llandaff Sub-Control Centre

Single storey rectangular building on E-W axis. Brick and concrete, projecting plinth, flat roof, roof level vents but otherwise featureless. Entrance on W end in slight projection, doorway recessed, door modern security replacement.

Entrance leads to timber door then small ante-room with messenger waiting room to right and ahead onto an axial corridor along the entire length of building. Rooms to either side of the corridor – operational rooms on right (S) side, support and plant rooms on left (N).

From the messenger waiting room the operational rooms comprise message room with timber acoustic cubicles, then large control room (now empty). Support and plant rooms comprise: plant room with generating equipment, ventilation plant, controls and switchgear installations intact, gents WC (urinals etc surviving), small kitchen (with Belfast sink, boiler and cupboards), ladies WC (toilets etc surviving), storeroom (originally ladies dormitory), dormitory with steel-framed double bunks, and at the end the liaison officer’s room.

4-panel timber doors survive throughout, various telephones and other original wall fixings, including air ventilation ducts and light switches, also survive. Operation rooms have interconnecting communication hatches in the dividing walls to allow communication between adjacent rooms.