Now the police pillar has been replaced I am placing this cache previously hidden by fr8ys as Tardis Mini (
https://coord.info/GC26Q3C) which was one of the popular finds in London attracting 1980 finds before being archived due to the work which took place creating Boris's cycle lane.
This is muggle central, especially during rush hour and at lunchtimes with people sitting in the nearby church grounds, so extreme stealth is required here (hence difficulty rating based on stealth). Best on a weekend or very early morning or evening (when difficulty rating could be a 1). the nearby church has interesting sculptures in the grounds.
Police Pillars are no longer in service.
The first Police Box (like the Doctor’s Tardis) was introduced in the 1920’s and enabled policemen on the beat to keep in touch with the station and for members of the public to make calls to the emergency services.
The Pillar was introduced later (Kent for example began using these in 1943).
As a City of London Police Post, the Bright Blue is the historically accurate color. From what I understand even Police Posts outside the City of London were painted in this Bright Blue called Bermuda Blue. All except for Edinburgh where historical documents indicate they were painted silver.
Dark Blue was the color of the Metropolitan Police Posts, with the M Crown P cast into the panel. They also have a Fresnel glass in place of the red glass they have for the signal lantern.
As with all caches in London GPS signals are poor so find the object find the cache!
Trivia - Did you know that the copyright in the use of the image of a Police Box is now owned by the BBC to market them as a Tardis?