Defence Secretary

The Secretary of State for Defence, shortened to Defence Secretary and sometimes incorrectly refer to as the Defence Minister, was in charge of the United Kingdom's Ministry of Defence. In UNIT matters, the Defence Secretary had oversight of them in the UK and could have the commander replaced. (AUDIO: Death in Geneva)

Defence Secretary Stephen Mulryne was assassinated in November 1963, following a scandal involving him, a prostitute, and a Soviet agent. Sir Francis White replaced him. The assassination, and White, were a plot by the Light to control the Earth; White himself was shot by Ian Gilmore. (AUDIO: 1963: The Assassination Games)

In the 1970s, the Defence Minister during the Axos affair had sent Horatio Chinn, a man he loathed, to investigate UNIT and ensure they were following MoD guidelines. When Britain had the chance to have a monopoly on Axonite, he granted Chinn the powers to arrest UNIT and was left politically embarrassed when this was leaked to the United Nations. (TV: The Claws of Axos)

In 1999, Jennifer Hamilton was Defence Secretary. She colluded with the Prime Minister's Voracian scheme and was murdered when she tried to back out. (PROSE: Millennium Shock)

In 2005, a panicked Defence Minister called MI6 to report the activation codes for the nuclear arsenal had been wiped. (COMIC: The Flood)

In 2009, a Defence Secretary was part of the attempt to cut a deal with the the 456 (TV: Children of Earth: Day Three, Children of Earth: Day Four) and ultimately ordered the British Army to kidnap children and deliver them to the aliens. (TV: Children of Earth: Day Five)

Brian Williams was Defence Secretary in 2014. (HOMEVID: When to Die)

In the mid-2010s, Kate Stewart referred to the Defence Secretary as "her". (AUDIO: Death in Geneva) The Defence Secretary gave Sir Peter Latcham, the Energy Secretary, authorisation to enter UNIT's Tower of London base. (AUDIO: The Battle of the Tower)

Behind the scenes

 * Mulryne's scandal in The Assassination Games is a reference to the real-life . The real scandal went public under the Macmillan government rather than under Douglas-Home (and was one of the reasons Macmillan resigned).
 * The minister in The Claws of Axos strongly resembles, the incumbent Defence Secretary in 1971.