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GCHQ, Cheltenham

GCHQ Building

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