I was an officer in the Royal Observer Corps responsible for a cluster of six of these 'bunkers'.

We had the job of reporting the fall of nuclear weapons, location and power. Intensity and arrival of fallout (we were responsible for fallout warning of the population) and secondarily providing weather information to provide a wartime forecast service.

The purpose did not include surviving a nuclear war. A destroyed post still provided information in a way.

There was a programme of installing hand operated Luwa filter units to some posts but the stand down occurred before it could be rolled out.

The 3W pea bulb was supplied from a large NiFe battery and a generator was supplied for recharging but it would last weeks, It was plenty of light to operate and, of course, helped during a night deployment. A one hour timer was fitted that had to be continuously reset to ensure the load was not left on accidental.

We had regular exercises where the post was operational for 72 hours with three people and ventilation was never a problem, We cooked on picnic stoves, gas or paraffin with no difficulties and heating was never needed, the temperature was just about comfortable.

I think that is all the points above, any more questions?