Aubrey Fairchild (Beautiful Chaos)

Aubrey Fairchild was briefly the Prime Minister of the United Kingdom in the 2000s, following the also brief tenure of under the name "Harold Saxon". According to the Tenth Doctor, while he knew many prime ministers, Fairchild came from a century in which prime ministers "come and go annually", and made "no impression on history", making Fairchild unfamiliar to the Doctor. (PROSE: Beautiful Chaos)

Biography
He made a false promise that a series of worldwide blackouts would not affect the UK. (TV: Revenge of the Slitheen)

The Prime Minister contacted Jack Harkness regarding the Water Hag flu epidemic. (PROSE: Something in the Water)

Fairchild declared a state of emergency following the Mandragora Helix's attempt to take over Earth. He was telephoned by Professor Brian "Ahab" Melville the night before on a secure line. (PROSE: Beautiful Chaos)

During the Dalek invasion of Earth, the Prime Minister's plane lost contact with Torchwood 3. (TV: The Stolen Earth)

Alternate timeline
In an alternate timeline, the Prime Minister approved the exposure of Torchwood, and was then destroyed by his own policy of disclosure and open government. His administration fell in weeks, and Torchwood acceded to power in days. (PROSE: The Twilight Streets)

Behind the scenes
Fairchild is not directly identified as the name of the prime minister in any story released prior to or following Beautiful Chaos, only inferred as such based on various Doctor Who, Torchwood, and The Sarah Jane Adventures stories taking place after the death of in TV: Last of the Time Lords and before the appearance of Brian Green in TV: Children of Earth: Day One.

Alternate draft
Originally, Fairchild was to meet a Dalek saucer descending on Westminster, before being exterminated. Jack Harkness, at Torchwood Three in Cardiff would have urged the Prime Minister not to do it. The scene was dropped at an early draft, partly for time but partly because Russell T Davies thought the Daleks wouldn't be "so diplomatic".