In an emergency always dial 999
You should dial 999 when :

1. there is a danger to life or risk of injury
2. a crime is in progress and the offender is still at the scene or has only just left
3. immediate police attendance is necessary such as when a crime is obviously about to be commited.

Otherwise, always call : 08457 444 888 24 hours a day, for all non-emergency calls
Telephone : 01905 723000 if outside of the force area

If you have information about crime, drugs or criminals, ring Crimestoppers on 0800 555111