6A certificate purporting to be signed by a person’s commanding officer or any officer authorised by him to give the certificate, and stating the contents of, or of any part of, standing orders or other routine orders of a continuing nature made for—
(a)any formation, unit or body of—
(i)the regular army or any reserve land force;
(ii)the Royal Marines or the Royal Marines Reserve; or
(iii)the regular air force or any reserve air force;
(b)any division, class or other body of the Royal Navy, the Royal Fleet Reserve or the Royal Naval Reserve;
(c)any command or other area, garrison or place; or
(d)any ship, submarine, train or aircraft,
shall in proceedings against the person concerned be evidence of the matters stated in the certificate.