Crabtree

Crabtree was a police officer working in London in 1953.

He and Detective Inspector Bishop were tasked with investigating the mystery of the humans made faceless by the Wire. (TV: The Idiot's Lantern)

Personality
Unlike Bishop, Crabtree was plain-clothed, thuggish, and far from talkative. He was also not afraid to use violence; he knocked out the the Doctor with a "hell of a right hook" before the Doctor could talk to him. (TV: The Idiot's Lantern)