53.8 Not less than twenty (20) Business Days prior to the amendment or expiry of any relevant insurance policy (other than the expiry of any of the Operational Insurances in respect of which Sub-hubco must comply with the provisions of Section 4 of Schedule Part 15 (Insurance Requirements)), Sub-hubco shall submit to the Authority a request for approval from the Authority of the insurer and the principal terms and conditions of such insurance policy (and any revision to such terms and conditions or change in identity of such insurer), such approval not to be unreasonably withheld or delayed.
53.9 Sub-hubco shall provide to the Authority:
53.9.1 copies on request of all insurance policies referred to in Clauses 53.1 to 53.3 (together with any other information reasonably requested by the Authority relating to such insurance policies) and the Authority shall be entitled to inspect them during ordinary business hours; and
53.9.2 evidence that the premiums payable under all insurance policies have been paid and that the Insurances are in full force and effect in accordance with the requirements of this Clause 53 (Insurance) and Schedule Part 15 (Insurance Requirements).
53.10 Renewal certificates or other such evidence of renewal in relation to the Insurances shall be obtained as and when necessary and copies (certified in a manner acceptable to the Authority) shall be forwarded to the Authority as soon as possible but in any event within 20 Business Days of the renewal date.
53.11 If Sub-hubco defaults in insuring or continuing to maintain the Insurances, the Authority may insure against any risk in respect of which such default has occurred and recover any premiums from Sub-hubco as a debt provided that if the default occurs during the Operational Term the amount recoverable from the Sub-hubco shall be the difference between the premiums had Sub-hubco continued to maintain the Insurances and the premiums paid by the Authority to take out and maintain the Insurances.