Site Name: Station Z - Air Ministry Citadel
In the grounds of In the grounds of Kodak Ltd.
OS Grid Ref: TQ148898
Sub Brit site visit 3rd November 2005
[Source: Nick Catford]
No sooner had the First World War ended than the Government started to worry about what might happen if there was another war. From 1924 Britain had committees of officials examining ARP questions and this examination intensified after Hitler came to power in Germany in 1933 and as the conviction grew, based on experience of the Spanish Civil War where the view was that the bomber would 'always get through'. It was assumed, naturally enough, that the main target for enemy air raids would be central London.
It was decided early in 1936 to appoint a Minister for the Coordination
of Defence and to launch an expanded five-year programme of rearmament.
France ratified a bilateral pact with Soviet Russia and on 7 March Hitler
sent his troops into the Rhineland in defiance of the Versailles and
Locarno treaties. The Cabinet now called for contingency plans to be
devised for coping with a potentially dangerous situation and among
new sub-committees set up under the Committee of Imperial Defence was
one on 'the location and accommodation of staffs of Government Departments
on the outbreak of war'.
Photo:Station Z which consists of a 3 storey office block plus basement and sub-basement
Photo from In the grounds of Kodak Ltd.
For the 'fighting' Departments work on bombproof underground citadels was to be continued, including one for the Admiralty at Oxgate in Cricklewood and one for the Air Ministry at Harrow
When this suburban scheme was examined further in the autumn of 1938, after the Munich crisis, it was decided that the construction of four underground citadels would go ahead: one each for the three Services and a fourth which became the bombproof Emergency War Headquarters at Dollis Hill.
The Emergency War Headquarters (Paddock) and the Air Ministry and Admiralty
Citadels were built as planned but that for the army at Kneller Hall
in Twickenham was abandoned before work started. As with Paddock and
the Admiralty Citadel at Oxgate the chosen site was within an existing
government facility, HM Stationary Office where a vacant plot of land
Photo:The lower floor (sub-basement) at Station Z
Photo by Nick Catford
In line with the original 1938 plan the Air Ministry citadel consisted of a three storey above ground surface block with an inner court yard. Below this was a basement roofed over by 3½ feet of reinforced concrete and below it a sub-basement protected by another 6 feet of concrete (probably in two layers); with comparable protection at the sides, the sub-basement was considered to be entirely bombproof. The building was almost identical to the Admiralty citadel in Oxgate Lane, Cricklewood.
The new Air Ministry site was ready for occupation by October 1940 as detailed in a minute sent to the Deputy Under Secretary of State for Air on 11.10.1940 (National Archive ref: Air 19/190)
"The Air Ministry Citadel is situated at the rear of HM Stationary
Office premises (HMSO Printing Works) Headstone Drive, Wealdstone, Middlesex.
It is known for the sake of anonymity as Z or the Stationery Office
Upper floor plan
Drawn by Nick Catford
If a move to Z were ordered the whole of the staff of the Air Ministry Whitehall would be involved but those divisions in the (Air Ministry) Kingsway Area would not be affected.
The Whitehall Group comprises: Secretary of State (for Air), Under Secretary of State, Permanent Under Secretary and part of the departments of the Permanent Under Secretary, the Chief of the Air Staff and the department of the Chief of the Air Staff (i.e. Directorate of Signals, Directorate of Intelligence, Directorate of Operations (Home), Directorate of Operations Naval Co-operation, Directorate of Operations (Overseas), Directorate of Plans, Directorate of Public Relations, Directorate of Operations Requirements and Directorate of Ground Defence.
(They would all be relocating from the new protected Government Office in Whitehall adjacent to the cabinet war room.)
Communications: The Air ministry Citadel may be obtained on the telephone
from the Cabinet Offices in Richmond Terrace or Paddock by the following
Post war plan of the Kodak site showing Station Z
For further information and pictures of Station Z click here
[Source: Nick Catford]