The Network Rail (Huyton) Order 2014

4.  Where any railway protection works are constructed by Network Rail under article 20 (cases where powers of acquisition limited to railway protection rights) on any land or buildings belonging to BT—

(a) such railway protection works must be maintained by and at the expense of Network Rail for a period of 12 months from the completion of such railway protection works;

(b) at the expiry of that 12 month period Network Rail must pay BT a capitalised sum representing the costs which may be expected to be reasonably incurred by BT in maintaining such railway protection works; and

(c) subject to Network Rail making the payment under sub-paragraph (b) such railway protection works must be maintained by and at the expense of BT.