Paragraph 61 I1

The undertaker must pay to C.RO the reasonable costs incurred by C.RO of such alterations to the marking and lighting of the navigational channel of the river as may be necessary during or in consequence of the construction of a tidal work or the use of the authorised development, including but without limitation, paying the reasonable costs of C.RO incurred in raising the height of the “IsoGWR.4 s” sector light positioned in the entrance of North Killingholme Haven at HST, in the event that activities related to the construction or operation of the authorised development obscure or obstruct the visibility of this sector light to vessels approaching HST and in its approach channels.