17. Where, in accordance with the provisions of this Schedule, Merseytravel affords to the specified undertaker facilities and rights for the construction, use, maintenance and renewal in land of Merseytravel of alternative apparatus in substitution for apparatus to be removed as aforesaid, those facilities and rights shall be granted upon such terms and conditions as may be agreed between Merseytravel and the specified undertaker or, in default of agreement, determined by arbitration.
18. In determining the terms and conditions mentioned in paragraph 17 in respect of alternative apparatus to be constructed across or along the authorised works the arbitrator shall—
(a)give effect to all reasonable requirements of Merseytravel for ensuring the safety of the authorised works and for securing any subsequent alterations or adaptations of the alternative apparatus which may be required to prevent interference with any such works; and
(b)so far as it may be reasonable and practicable to do so in the circumstances of the case, give effect to any terms and conditions applicable to the apparatus (if any) constructed across or along the authorised works for which the alternative apparatus is to be substituted and to any other reasonable requirements of the specified undertaker.
19. If the facilities and rights to be afforded by Merseytravel in respect of any alternative apparatus under paragraph 17 and the terms and conditions subject to which the same are to be granted are, in the opinion of the arbitrator, more or less favourable on the whole to the specified undertaker than the facilities, rights, terms and conditions applying to the apparatus to be removed, the arbitrator shall make such provision for the payment of compensation to or by Merseytravel by or to the specified undertaker in respect thereof as shall appear to him to be reasonable having regard to all the circumstances of the case.