Special envoy

Under the mandate of homeworld security, Sir Alistair Gordon Lethbridge-Stewart continued to work for UNIT as a special envoy in the late 2000s, despite claiming to be retired. (TV: Enemy of the Bane)

In 2009, Alistair Gordon Lethbridge-Stewart was stranded in Peru and thus unable to assist UNIT in the Sontaran invasion of Earth. (TV: The Poison Sky) He later returned to Britain for a while (TV: Enemy of the Bane) but later returned to Peru and was unable to attend Sarah Jane Smith's wedding to Peter Dalton. (TV: The Wedding of Sarah Jane Smith) He was still in Peru at the time of the Eleventh Doctor's supposed funeral and so was unable to attend. (TV: Death of the Doctor)