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 "MI5"): The Security Service, also MI5 (Military Intelligence, Section 5), is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ) and Defence Intelligence (DI).
Relevant evidence: Yes