Ken Livingstone

Ken Livingstone was the mayor of London in 2004.

Biography
Ken had met the Doctor's eighth incarnation at some point in the 20th century and was aware of the Doctor's dealings with UNIT in preventing alien invasions.

In 2004, Ken was tied up in his office and an android duplicate of Ken was created. The android allowed the Doctor and his companions into Tate Modern and was responsible for the speech at the opening ceremony of the Tomorrow Windows. During the speech, the duplicates head split in two, reveaing an Electron bomb the later destroyed Tate Modern.

The real Ken was later found in his office by the police. (EDA: The Tomorrow Windows)