According to The Sunday Times in London, only four percent of robberies in England and Wales in 2017 were solved. Only three percent of burglaries were solved. In short, thieves and robbers can pretty much go at it with impunity.
Here in the US, I think the numbers are not much better. I ask all the time, and NO ONE feels safer when a police car is behind them, and NO ONE has ever told me they had stolen stuff returned to them by the police.
Suffice it to say that in both countries, Sherlock Holmes is on the fiction shelf.