Location Cassiobury Drive,Watford,Herts The building is now a veterinary practice. List of ROC Group Headquarters and UKWMO Sector controls - Wikipedia
Think this should go under Postwar, Clive. Unless there's some WW2 history you know of with the site? So like the 14 Group Winchester HQ I used to sometimes play nuclear war at. Chatting to a mate that's doing some survey work at another broadly similarly-purposed site made me wonder if much of it was thrown up in '63-ish when the Missile Crisis warmed things a tad. (Though IIRC, a fair bit of the internal 'survival' equipment was WW2 date-marked). Anyway, they always looked a bit rough & ready. Wonder if their diesel tank was entirely unprotected & under the car park too...
Found this ROC 5 GROUP HEADQUARTERS in Cassiobury Drive Watford. 17 Group as it was designated during the war moved into their new purpose built headquarters in 1943 having vacated their former HQ in the GPO buildings in Market Street Watford. The new centre consisted of a central brick built two storey control room with single storey prefabricated blocks around it, similar to WW2 centres at Winchester and Bedford (now demolished). Unlike Winchester and Bedford a brick second storey has also been added to one of these blocks. In 1953 Watford was redesignated 5 Group with protected accommodation being opened at the rear on the 18th November 1961. Research Study Group: Sites: Watford ROC Group HQ No 5
Which definitely explains most of the HQs' somewhat jerry-built nature. Not that it mattered. Once Ivan had reached the area nobody was going to worry much about defending it. Long as it held together for a week or two post-strike.
Interesting to see this building. I have a WW1/WW2 ROC Group to a soldier from Liverpool. He served with R.O.C. Group 19-Bromley.