Security surrounding the Radio 1 interview will be tight. Director Kwame will almost certainly be interviewed from inside MI6 and is unlikely to make the trip to the BBC studios, for security reasons.

The tunnels’ next wartime role was as the home of Britain’s top-secret Special Operations Executive, an offshoot of MI6. Ian Fleming ... for the museum to move inside the tunnels officially.

The 36-year-old whistleblower will next month tell a court that the cash was paid by MI6 spymasters who had hatched an unofficial plot to blow up the Libyan leader Colonel Gadaffi in 1996.

BBC security correspondent Gordon Corera looks inside Britain's Secret Intelligence Service. He talks to senior intelligence officers, agents and diplomats about the shadowy world of espionage ...