of which the person has been convicted, including details of any convictions which are spent within the meaning of section 1 of the Rehabilitation of Offenders Act 1974f1 and which may be disclosed by virtue of the Rehabilitation of Offenders Act 1974 (Exceptions) Order 1975f2; or
(b)
in respect of which he has been cautioned by a constable and which, at the time the caution was given, he admitted.