A copy of a writing is presumed to be genuine if it purports to be a copy of a writing which is authorised by law to be recorded or filed and has in fact been recorded or filed in an office of a public entity or which is a public record, report, statement or data compilation if-

(a) an original or an original record is in an office of a public entity where items of that nature are regularly kept; and

(b) the copy is certified to be correct by the custodian or other person authorised to make the certification, provided that the certification must be authenticated.