15. Network Rail Infrastructure Limited shall, on receipt of a request from DLRL, from time to time provide DLRL free of charge with written estimates of the costs, charges, expenses and other liabilities for which DLRL is or will become liable under this Schedule (including the amount of the relevant costs mentioned in paragraph 14 and with such information as may reasonably enable DLRL to assess the reasonableness of any such estimate or claim made or to be made pursuant to this Schedule (including any claim relating to those relevant costs)).