Backbencher
From Tardis Wiki, the free Doctor Who reference
MP Harriet Jones, of Flydale North, described herself as a "lifelong" backbencher. (TV: Aliens of London) Heathcliffe Bower was a Conservative Party backbencher during Margaret Thatcher's time in office. (PROSE: The Assassin's Story) Charles Grover was a junior backbencher during the Cold War. (TV: Invasion of the Dinosaurs)