Captain Scooby
A word of caution if I may.
A colleague fell foul of this when the CRB check was first introduced. He had forgotten to renew a shotgun licence and was prosecuted by an overzealous police force. This occured some time before and didn't (at the time) cause him a problem. When he applied for his CRB check the conviction was flagged up and he failed the check as "firearms" offences are not permissable for airside passes.
He lost his job..........