But with many different demands on police time, some not relating to crime, it's hard to estimate.
The murder of 11-year-old Rhys Jones in Liverpool in 2007 sparked a national debate on armed gangs – but what has changed 10 years on?
The 19th century Irish crimewave that wasn't: how a change of policing brought the English counterfeiters to book.
Taking on a 45,000-strong organisation, with a budget of more than £2.5 billion would stretch the most seasoned corporate executive.
Should we hold victims responsible for crimes committed due to their own carelessness? The Victorians said we should and they may have had a point.
It could even help crack long-forgotten cold cases.
Mark Duggan was shot by the police in 2011, but it took two-and-a-half years to complete an inquest into his death.
Too often, the moral character of women who commit neonaticide plays a part in their trial.
Was this the last of the old-school bank 'capers'?
There's a surprising amount of resistance to making policing a graduate profession.
People love all things spooky and gory: but when does dark tourism cross the boundary?
The folklore of the Krays is recast in order to shine light on current attitudes toward crime deviance and in particular, violence.