Paragraph 4 I1

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;

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

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.