It is the duty of every person, body or authority having power under any enactment to make byelaws which may provide for or relate to public access to land in respect of which access rights are exercisable and which is owned or managed by that person, body or authority—
(a)within 2 years of the coming into force of this section, to review those of its byelaws which so provide or relate and are in force at the time of the review; and
(b)to modify any of those byelaws which are inconsistent with the provisions of this Act (including any made under it) as they apply to that land so as to make them consistent.