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GCHQ, Cheltenham

GCHQ Building

The Doughnut is the nickname given to the headquarters of the Government Communications Headquarters (GCHQ), a British cryptography and intelligence agency. It is located on a 71-hectare (176-acre) site in Cheltenham, Gloucestershire, in South West England.

It is the largest building constructed for secret intelligence operations outside the United States. Beneath the central green roof a PermaQuik waterproofing system was specified to provide a lifetime of waterproofing security byRadmat Building Products.