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Yes, it is very likely that it will still show up. All convictions, cautions, etc will show up, even if they have been spent, unless they have been removed from the Police National Computer (PNC). There is no hard rule about their removal and some police forces remove minor offences after some time, but that is purely at their own discretion and they are certainly not obliged to do so.
You can check what is held on the PNC before the CRB check is done by writing to the police force that dealt with the offence and making a Subject Access Request under the Data Protection Act 1998. Include proof of identity and tell them you would like to see all information held on the PNC for that person.
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