In the event of a nuclear attack, these posts would have been manned by three members of the Royal Observer Corps (ROC). Their role would be to note the details of a nuclear burst and relay this information to UKWMO headquarters. This information would then be used by government and local authorities in order to decide how best to protect civilian life.
These bunkers had no mains water, electricity, gas, or heating. The only communication with the outside world was by way of a simple Tele-Talk system to headquarters and 3 to 4 other nearby ROC posts in the ‘cluster group’. The master post in each cluster group was the only post to be equipped with radio communications as a back-up.
The ROC was stood down in 1991 following the end of the Cold War and the collapse of the Communist Bloc. About half of all ROC posts were demolished. The others remain in a derelict and abandoned state. A few have been preserved.