5.1 Each High Value Change Proposal and each High Value Change Stage 2 Submission shall be valid for a period of three (3) months from the date of its submission by Sub-hubco.

5.2 If by the end of the three (3) month period referred to in paragraph 5.1 of this Section 4 (High Value Changes) the Authority has not:

5.2.1 in relation to a High Value Change Proposal, approved or rejected that High Value Change Proposal in accordance with the procedures set out in this Section 4 (High Value Changes):

(a) Sub-hubco shall be entitled to withdraw the High Value Change Proposal; and

(b) Sub-hubco shall not be entitled to any costs relating to the High Value Change Proposal unless the Authority has either not responded to the High Value Change Proposal and/or is in material breach of its obligations in paragraph 3 and/or paragraph 4.4 of this Section 4 in which case paragraph 8.5 of this Section 4 (High Value Changes) shall apply

5.2.2 in relation to a High Value Change Stage 2 Submission, approved or rejected that High Value Change Stage 2 Submission in accordance with the procedures set out in this Section 4 (High Value Changes) (or has not given any notification of the Authority's response to the High Value Change Stage 2 Submission or has given written notice to Sub-hubco withdrawing or cancelling the High Value Change to which the High Value Change Stage 2 Submission relates) then the High Value Change Stage 2 Submission shall be deemed to have been improperly rejected by the Authority and paragraph 8.5 shall apply.