Channel Tunnel Act 1987

4 If—

(a) the appropriate authority, for the purpose of carrying out any work authorised by this Act in, on or under any land, require the removal of any apparatus placed in that land, and give to the undertakers not less than 56 days' written notice of that requirement, together with a plan and section of the proposed work, and of the proposed position of the alternative apparatus to be provided or constructed; or

(b) in consequence of the exercise of any of the powers conferred by this Act, the undertakers reasonably require to remove any apparatus;

the appropriate authority shall afford to the undertakers the necessary facilities and rights for the construction of any necessary alternative apparatus in other land held by the appropriate authority, or in which the appropriate authority have sufficient rights or interests, and thereafter for the maintenance, repair, renewal and inspection of such apparatus:

Provided that, if the alternative apparatus or any part thereof is to be constructed elsewhere than in other land held by the appropriate authority and the appropriate authority are unable to afford such facilities and rights as aforesaid, the undertakers shall, on receipt of a written notice to that effect from the appropriate authority, forthwith use their best endeavours to obtain the necessary facilities and rights.