The Office of Rail and Road may give directions requiring the parties to an access agreement to make to the access agreement amendments which are, in its opinion, necessary to give effect to the conditions of a licence or otherwise required in consequence of the conditions of a licence.
The Office of Rail and Road shall not have power to direct or otherwise require amendments to be made to an access agreement except in accordance with section 22A above, subsection (1) above or Schedule 4A to this Act.
If an access agreement includes provision for any of its terms to be varied—
by agreement of the parties, or
by direction or other requirement of the Office of Rail and Road,
a variation made pursuant to that provision shall not be regarded for the purposes of section 22 above or subsection (2) above as an amendment of the agreement.