27.5 Sub-hubco shall, and shall procure that all Sub-hubco Parties shall, comply at all times with the Authority Policies.
27.6 The Authority shall notify Sub-hubco of any proposed change to the Authority Policies as soon as practicable (and, in any event, prior to such change taking effect) and consult with Sub-hubco. Subject to Clause 27.7, such change shall take effect as a Change in accordance with Schedule Part 16 (Change Protocol).
27.7 The Authority may, at its sole option, notify Sub-hubco that Sub-hubco shall not be obliged to comply with any change to any Authority Policy and that Sub-hubco should continue to comply with the relevant Authority Policy prior to any change in which case such change shall not take effect as a Change in accordance with Schedule Part 16 (Change Protocol).