Police Station, The Rocks

The traditional blue police light in The Rocks.

Why are police associated with the colour blue in so many places - blue uniforms, the thin blue line, blue lights, blue call boxes (the most famous of which is the TARDIS*: and if you don't know what that is, well, you've led a culturally deprived life ;-) ?

It seems it dates back to the first organised police force in the world, Sir Robert Peel's Metropolitan Police in London.

When formed in 1829 it was decided that their uniform should be completely different in all ways to the uniform worn by the military which had been used for policing major disorder in London and the rest of the country. So, they had a civilian uniform of blue high collared tailcoat, worn with white trousers and hardened top hats, as opposed to red uniforms of the military. The top hats, by the way served the dual purpose of providing head protection and acting as a step to allow officers to climb or see over walls!

* TARDIS: see here