The recording of crime is governed by the National Crime Recording Standard (NCRS). NCRS only applies to those notifiable offences which should be notified to the Home Office and not to all offences which are reported to the police.
Notifiable offences include all offences that could possibly be tried by a jury (these include some less serious offences, such as minor theft that would not usually be dealt with this way) plus a few additional closely-related offences, such as assault without injury.
The NCRS states that:
“Following the initial registration, an incident will be recorded as a crime (notifiable offence) for offences against an identified victim if, on the balance of probability:
(a) the circumstances as reported amount to a crime defined by law (the police will determine this, based on their knowledge of the law and counting rules), and
(b) there is no credible evidence to the contrary.
For offences against the State the points to prove to evidence the offence must clearly be made out, before a crime is recorded.”