Gainsey, the 'Bomber Box' you referred to in pubs, post offices, police stations, etc, wasn't the V-Force Bomber Box. The V Bomber Box was sited only in Service establishments, like ATC, Ops rooms and so on. The clicking box was something to do with the Civil Defence and Royal Observer Corps Nets - I'm not sure how they worked, though.
Blue Steel was a whacky bit of kit. I well remember QRA with the Missile - the co-pilot and AEO had to take High Test Peroxide (HTP) readings inside the aircraft every so often overnight. It was a real pain. The water pits referred to were very necessary - they were sited round the country as part of a network of emergency off-load airfields. If the HTP temperature rose towards critical levels in flight, the crew declared an appropriate emergency and landed at the nearest airfield to pump the HTP out of the missile, where the fire section would dilute it with copious quantities of water. That was a well-orchestrated drill involving the whole crew. It was called 'Red Hot Water' and struck fear into the heart of the average Stn Cdr. The worst that could have happened was the missile jettisoned on the ground and subsequently exploding. It would have made a very large mess of the surrounding area - hence the fact that the offload pits were sited in remote parts of the airfield, where the blast would cause least damage.
HTP was leathal stuff - dirty clothing would catch fire if splashed with HTP. All dispersals had heated plungebaths next to them, covered with a layer of table tennis balls to reduce the heat losses. The idea was that if anyone got splashed with HTP they would plunge into the bath fully clothed, where the water would dilute to safe state the HTP. Seen it done several times - hilarious, unless it's you in the middle of winter!