I did smile when I saw this advertisement from 1936 when a Police Public Call Box was seen as something other than a Time Lord's mode of transport.
The Police Box is a public telephone kiosk or the use of members of the police or for members of the public to contact the police. It was used in the United Kingdom throughout the 20th century from the early 1920s up until the early 1970's when the newfangled 2 way police radio ala Pye PF2AM/PF2FM Pockefone 70 series made them obsolete.
The Police Box could also be used for the writing of a policeman's report, an incarceration centre when someone was caught bang to rights, somewhere for the police officers to take a crafty fag break, tea break or even by some villains - a "comfort break." Although by no means luxuriously appointed, every Police Box boasted a stool, a table with drawer, a brush and duster, a fire extinguisher, a first aid kit, and a small electric heater as well as a light at the top of each box, which would flash as a signal to police officers indicating that they should contact the station
The design of the Police Box was finalised by Gilbert Mackenzie Trench during 1929. By 1953, there were 685 police boxes on the streets of Greater London with over 1100 being built Nationwide.
Why I hear you non-Whovians ask? Well The answer, of course, comes from the first series of Dr. Who called "An Unearthly Child." where two high school teachers attempt to visit the home of their bright but curious student Susan Foreman. What they find instead is a junkyard with a blue police box oddly placed in the middle of it, inhabited by Susan and her grandfather, The Doctor.
When the two professors enter the police box and discover that it's bigger on the inside, The Doctor finally explains that they're inside a space-time ship and the police box design on the outside is a disguise to blend in with the outside world. What's odd is that when The Doctor takes them back in time to prove that the TARDIS is indeed a space-time machine, it still maintains a police box appearance on the outside.