General Asquith was the Chief of the Defence Staff, the most senior military officer in Britain at the time of the Slitheen alien landing in 2006.
Summoned to Albion Hospital, Asquith was shocked by the Space Pig recovered from the crashed spaceship that landed in the Thames, wondering why a human animal would be in an alien craft. He later arrived at Downing Street to brief the Acting Prime Minister, Joseph Green. Asquith, appalled at Green's leadership, threatened to remove Green from command and put the country under martial law. Green and his colleagues, Margaret Blaine and Oliver Charles, revealed themselves to be Slitheen in disguise and killed General Asquith, using his skin as a disguise for the Slitheen who occupied the body of Oliver Charles. As Asquith, the Slitheen had control of the British military.
Harriet Jones, an MP who was hiding in the Cabinet Room, witnessed Asquith's death and later informed Rose Tyler about it. The Slitheen impersonating Asquith was killed when a missile destroyed Number 10. (DW: Aliens of London/World War Three)