The bunker is situated on Fobney Water Treatment Works in Whitley, Reading.
Similar to the Blunsdon Thames Water Bunker in Swindon that has now been demolished.
There were three divisions of the Thames - West, Central, East, each division would have protected communication centres however the western division was done first but the cold war ended before the other areas were completed.
Therefore there was no central HQ bunker, all the bunkers would have been autonomous this includes Reading, Donnington, Blunsdon (Swindon) and Latton in Wiltshire which is also the site of their peacetime control centre.
These bunkers were just comms centres to manage engineers and recovery, not telemetric control centres for water, All these type of bunkers were built between 1990-1991.