I have a blue plastic folder from 1973 which contains RAF form 856 "Certificate of Discharge" which shows start and end dates, also form 856b "Certificate of Qualifications" and form 856c "Job Description".
The certificate of discharge is signed by a Squabbling Bleeder OC PSS whatever that was. I also have my father's cardboard form 856 from 1958 when he left at age 55. And his pay book which contains details of his qualifications and medals etc. Maybe the forms have been dropped in one of the money-saving schemes.