Frank Armitage

Mr Armitage was a staff member at Coal Hill School in the 2010s. He introduced Clara Oswald to Danny Pink. (TV: Into the Dalek)

During a meeting, he introduced the staff to the school's new temporary caretaker, "John Smith", who was actually the Twelfth Doctor working undercover. He was present at parents evening, and stated to Mr Woods and Mrs Woods that Clara should be back in a few minutes, after she had run off with Danny. (TV: The Caretaker)

It is not clear what position Armitage holds at Coal Hill. He appears to be in a position of authority, leading staff meetings and assigning duties (social and class-related), but he is not the headmaster, who is one W. Coburn.