John Major

"Major" was a Prime Minister of the United Kingdom in 1996 who, according to the Eighth Doctor, served between Margaret Thatcher and Tony Blair. (PROSE: Interference - Book One)

Behind the scenes

 * Major's forename wasn't given in Interference, but the common-sense interpretation of the passage is that the author was referencing the real-life Prime Minister John Major.
 * Due to the 1997 general election, The Dying Days mentions an election but doesn't say if the Prime Minister is new or a returning Major.
 * Major was played by Keith Drinkel in and Michael Maloney in.