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Original Text (Annotation: EAW035177 / 847389)
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Station Z - Air Ministry Citadel.
It was planned in 1938, during the run-up to WW2, as an emergency HQ for the Air Ministry (RAF). In this it would serve the same purpose as the similar constructions built for the War Cabinet ('Paddock' - beneath the GPO Research Building at Dollis Hill) and the Oxgate Admiralty Citadel at Cricklewood. In the event of a devastating attack on London, the respective bodies would be able to relocate to these emergency facilities.
The Air Ministry Citadel was constructed on land at the rear of the HMSO building at Wealdstone and consisted of a three storey brick surface block surmounting heavily reinforced basement and sub-basement levels.
The block was demolished in the 90s after it had been acquired by Kodak. The protective underground levels survive.
The link below provides more detailed information.
http://www.subbrit.org.uk/sb-sites/sites/s/station_z/index1.shtml '