There is no higher authority.

“Steven wrote to me today, saying, 'Don't you feel like sticking your head out o…”

“Cyber Leader: Daleks, be warned. You have declared war upon the Cybermen. Dalek…”

“I saw the Fall of Troy! World War Five! I was pushing boxes at the Boston Tea P…”

“The Doctor: Hello, I've come to see the Lord Mayor.Idris Hopper: Have you got a…”