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I think I have an answer myself:- Cautions will always remain on a person's record but as explained above will be stepped down after 5 or 10 years. There are only exceptional circumstances when a caution could be removed from a person's record and it is anticipated that such incidents will be rare. Examples of such possible circumstances are that it was found that the original arrest or sample was unlawful or where it was found beyond all doubt that no offence existed. Any requests that fit the above criteria should be directed to the Chief Constable of the force concerned.
Sara 3- quite a complicated one but I was arguably forced to admit the caution- certainly given the nature of the alledged offence a trial would have been destructive to family .new evidence sufggests that the arrest itself may have been unlawful.