Except with the consent of the persons interested, no order made under section 29 shall abrogate or affect—
(a)any provision contained in a local enactment for the protection or benefit of any specified person or class of persons or body of persons whether incorporated or not, other than a provision with respect to the discharge of compensation water into any watercourse;
(b)any provision contained in a local enactment for conferring on or preserving to the public rights of enjoyment of air, exercise and recreation on land or rights of access to land for those purposes or for conferring any right of way.