#ColdWarHistory #CHANTICLEER One of HMG's most vital Cold War secrets was maintaining the security of its highly classified (TOP SECRET - FILCH) underground Central Government War HQ, codename: CHANTICLEER. On 01 October 1975, CHANTICLEER suffered a significant security breach. #ColdWarHistory #CHANTICLEER On 16 September 1975, the PSA asked permission from the Superintendent RN Stores Depot, Copenacre (responsible for the highly classified underground Central Government War HQ - CHANTICLEER) for the RAF to conduct an aerial photo survey of MOD Corsham.

#ColdWarHistory #PortonDown #LondonUnderground 55 years ago today, Porton Down scientists conducted a second covert release of live bacteria on the London Underground system. Porton were investigating how far a Biological Warfare aerosol would spread in the London Underground. #ColdWarHistory #PortonDown #LondonUnderground At exactly 13.00 on 01 May 1964, a trainee LU Engineer covertly dropped a converted face-powder case from the rear window LU train while it traveled northwards between Colliers Wood and Tooting Broadway.

#ColdWarHistory #TURNSTILE Just found the following remarkable 1967 assessment of the vulnerability of Whitehall staff dispersed in war to the former Central Government War HQ at Corsham (then codenamed TURNSTILE), which was soon to be a decoy site for the new PYTHON concept. #ColdWarHistory #TURNSTILE Such was the importance of maintaining the cover story that TURNSTILE was still the Central Government War HQ, that a small number of Whitehall staff would be dispersed to TURNSTILE, even though they apparently weren't expected to survive nuclear attack