" Once the telephone had been invented, it was only a matter of time before the police got in on the new technology and, first in Glasgow and then in London, the police box was born. Here a police officer in need of assistance could find a telephone link to Scotland Yard, a dry space to do “paperwork” and, in certain extreme cases, a life of adventure through space and time. "

― Ben Aaronovitch , The Hanging Tree (Rivers of London, #6)