20.  When a medical practitioner has made a post-mortem examination of the body of any deceased person, the medical practitioner shall, unless he knows that a Coroner’s inquest or inquiry is to be held in respect of the death, within 24 hours after the conclusion of the examination, forward a certificate in the prescribed form to any deputy registrar of the local registration area within which the body of the deceased person was found, and the cause of death as stated in the certificate shall be entered in the register.