Question: What United Kingdom government is based in "The Doughnut" in the suburbs of Cheltenham and works alongside MI5 as part of the United Kingdom's intelligence machinery?
Sentence (from "The Doughnut"): The Doughnut was too small for the number of staff at its completion, and a second building in a secret and undisclosed location in the 'Gloucestershire area' now also accommodates staff from GCHQ.
Relevant evidence: No