Stangmoor Prison was a prison in England. Before becoming a prison it was a fortress in the Middle Ages. It was the ideal place to demonstrate the Keller Machine, as there were many criminals available. Later, when and the inmates took it over, it was used as base of operations for his plan to hijack the Thunderbolt missile. UNIT sergeant John Benton was briefly the governor of Stangmoor after UNIT retook it from the convicts. (TV: The Mind of Evil) Prior to his death, General Andrews was the prison's governor. (AUDIO: The Last Post)