A Member of Parliament (or MP) was an elected representative of the British public who voted in the Houses of Parliament. Each MP represented their own constituency. (TV: Aliens of London/World War Three)
James Skinsale was the MP for Thurley in the early 20th century. (TV: Horror of Fang Rock)
Harriet Jones was MP for Flydale North, (TV: Aliens of London/World War Three) as was her counterpart in a parallel universe. (AUDIO: The Endless Night) In N-Space, Harriet later was elected as Prime Minister of the United Kingdom in 2006. (TV: The Christmas Invasion)
Joseph Green was MP for Hartley Dale before he was murdered and replaced by Jocrassa Fel-Fotch Passameer-Day Slitheen, who assumed his identity before his death in March 2006. (TV: Aliens of London, World War Three, PROSE: Rose sighting confirmed)
During the ghost shifts of 2007, a ghost, actually a parallel Earth Cyberman in disguise, was elected MP for Leeds. (TV: Army of Ghosts)
Rex Matheson jokingly suggested that Gwen Cooper write to her MP to complain about her rendition. (TV: Rendition)