President of Great Britain
From Tardis Wiki, the free Doctor Who reference
The President of Great Britain was the leader of the People's Republic of Great Britain on a parallel Earth.
One President of Great Britain, who knew Pete Tyler, was in office in 2007. Following his deletion by John Lumic's Cybermen that year (TV: Rise of the Cybermen), he was succeeded by Harriet Jones, who remained President into 2010. (TV: Doomsday)