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. He wondered why a human animal would be in an alien craft. He went to Downing Street to brief the Acting Prime Minister, Joseph Green. Asquith, appalled at Green's leadership, threatened to remove Green and put the country under martial law. Green and his colleagues, Margaret Blaine and Oliver Charles, revealed themselves as Slitheen in disguise and killed General Asquith. The Slitheen who had used the skin of Oliver Charles switched to Asquith. 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 told Rose Tyler about it. The Slitheen impersonating Asquith was killed when a missile destroyed Number 10. (DW: Aliens of London/World War Three)