All information relating to simple cautions (as well as convictions) issued for a recordable offence is retained on the Police National Computer (PNC).
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Per the Rehabilitation of Offenders Act 1974, simple cautions, reprimands and final warnings become spent (meaning that they do not need to be disclosed, unless applying for particular types of work) immediately, and conditional cautions become spent after 3 months.
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From 1995 cautions were recorded on the Police National Computer, and it was recommended that cautions should be retained for 5 years, though each police force could follow its own guidelines.
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As a result of this cold case review, DNA from envelopes sent by Humble as part of the hoax were matched in the United Kingdom National DNA Database with samples police had obtained from Humble in an unrelated incident in 2000, when he had been arrested and cautioned for being drunk and disorderly.