8The production of a printed copy of a byelaw purporting to be made by a river authority upon which is indorsed a certificate, purporting to be signed by the clerk of the authority, stating—
(a)that the byelaw was made by the authority ;
(b)that the copy is a true copy of the byelaw ;
(c)that on a specified date the byelaw was confirmed under this Schedule; and
(d)the date, if any, fixed under paragraph 5 of this Schedule for the coming into operation of the byelaw,
shall be prima facie evidence of the facts stated in the certificate, and without proof of the handwriting or official position of any person purporting to sign the certificate.