3.1 Sub-hubco must notify the Authority in writing as soon as practicable and in any event within fifteen (15) Business Days after having received the Authority Change Notice for a High Value Change if it considers that any of the circumstances set out in paragraphs 1.2.1 to 1.2.8 of this Section 4 (High Value Changes) apply. If no such notice is served, Sub-hubco must (within thirty (30) Business Days after having received the Authority Change Notice) either:
3.1.1 submit a High Value Change Proposal to the Authority; or
3.1.2 notify the Authority as to when the High Value Change Proposal will be provided to it (provided that Sub-hubco shall use all reasonable endeavours to obtain all the information that it requires, expeditiously).