Crabtree

Crabtree was a police officer working in London in 1953. DI Bishop and he investigated the mystery of the humans made faceless by the Wire. (TV: The Idiot's Lantern)

Personality
Crabtree served under DI Bishop. Crabtree was also a little similar to Dalek Jast — speaking only what he thought was vital to the matter at hand. Also, Crabtree was also not afraid to use violence albeit in a very unnecessary way — giving the Doctor a right hook to the face, knocking him out when he was in the process of saying they should listen to him for three reasons when Crabtree and DI Bishop hadn't 'taken' Grandma Connolly. It is possible that Crabtree could've thought the Doctor was a nuisance, but why Crabtree punched him remains unknown.