8.3 Where this paragraph 8.3 applies (as set out in paragraph 8.2.2(a), paragraph 8.2.4 and paragraph 16.4.2 of this Section 4 (High Value Changes)) the Authority shall not be required to reimburse or compensate Sub-hubco in respect of any costs relating to the High Value Change including the Change Management Fee.
8.4 If :
8.4.1 Sub-hubco fails to provide a response to an Authority Change Notice in accordance with paragraph 3.1 of this Section 4 (High Value Changes); or
8.4.2 (where applicable) Sub-hubco fails to provide a High Value Change Proposal in accordance with paragraph 3.4 of this Section 4 (High Value Changes); or
8.4.3 Sub-hubco fails to submit a High Value Change Stage 2 Submission in accordance with paragraph 4.1.2 of Section 4 (High Value Changes); or
8.4.4 the Authority has validly rejected a High Value Change Stage 2 Submission in accordance with paragraph 8.2 and the matter has not been referred to the Dispute Resolution Procedure or any such dispute has been determined as described in paragraph 16.4.2 of this Section 4 (High Value Changes),
then, subject to paragraph 17 of this Section 4 (High Value Changes) the Authority may notify Sub-hubco that the High Value Change Notice is withdrawn and, following such notification, may procure the implementation of the High Value Change without further recourse to Sub-hubco, but the Authority must ensure that the High Value Change is carried out in accordance with Good Industry Practice and to the standards that would have applied to Sub-hubco if it had implemented the High Value Change.