'Ullo, Ullo, Ullo, What’s All This Then?' The City of London Police

“Excellent!" I cried. "Elementary," said he.”

Arthur Conan Doyle, The Complete Sherlock Holmes

The City Police Force was formed in 1832.
The City of London, 'One Square Mile',  has its own police force, separate from the  Metropolitan Police and safeguarding the Square Mile, its 9,000 residents, 320, 000 workers, many tourists  and visitors.
The City of London Police Museum was opened on 7th November 2016 in the Guildhall.