3.1 Project Co 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, Project Co 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 Project Co shall use all reasonable endeavours to obtain all the information that it requires, expeditiously).