A photograph from the mid 1950s showing a Cannon Row PC leaving the Police box on Trafalgar Square. It is now used as an equipment store for the Trafalgar Square cleaners.
After WW1 there was a temporary police box near the entrance to the tube station, in 1926 the station was due to be remodelled and there were objections to a Police Box being put on the Square itself. The head of the Office of works, Sir Lionel Edwards subsequently wrote to Scotland Yard suggesting that the Police Box be put into the base of the lamp plinth on the south east corner of the square. This proposal was agreed to and the base was removed and the box was ’carved’ out of the core of the base. It appears that all this was done very quickly and the box was in use from 1927 or thereabouts. The box was used to house a telephone and when it rang the light on top (connected in 1936) flashed to draw the attention of officers on duty on Trafalgar Square. In my time in the 1970s there were two telephones in the box, one was a direct line to Cannon Row Police Station and the other was a direct line to the Criminal Records Office at New Scotland Yard.