There is no higher authority.

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

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

“...Something we once loved, and love now, in the shape of a book. Maybe eBooks …”

“Harriet Jones: When they fart, if you'll pardon the word, it doesn't smell like…”