Formal Amendments to the Contract a. Except as provided in Condition 31 and subject to clause 6.c, the Contract may only be amended by the written agreement of the Parties (or their duly authorised representatives acting on their behalf). Such written agreement shall consist of:
(1) the Authority Notice of Change under Schedule 4 (Contract Change Control Procedure) (where used) and;
(2) the Contractor's unqualified acceptance of the contractual amendments as evidenced by the DEFFORM 10B duly signed by the Contractor.
b. Where required by the Authority in connection with any such amendment, the Contractor shall (as so required) confirm that any existing Parent Company Guarantee is sufficiently comprehensive so as to cover and support all of the Contractor's liabilities and obligations under and in connection with the Contract (as amended by such amendment) or provide a revised Parent Company Guarantee with such DEFFORM 10B to achieve the same purposes.
c. Where the Authority wishes to amend the Contract to incorporate any work that is unpriced at the time of amendment:
(1) if the Contract is not a Qualifying Defence Contract, the Authority shall have the right to settle with the Contractor a price for such work under the terms of DEFCON 643 (SC2) or DEFCON 127. Where DEFCON 643 (SC2) is used, the Contractor shall make all appropriate arrangements with all its Subcontractors affected by the Change or Changes in accordance with clause 5 of DEFCON 643 (SC2); or
(2) if the Contract is a Qualifying Defence Contract, the Contract Price shall be redetermined on amendment in accordance with the Defence Reform Act 2014 and Single Source Contract Regulations 2014 (each as amended from time to time).
d. The Specification forms part of the Contract and all Contract Deliverables to be supplied by the Contractor under the Contract shall conform in all respects with the Specification.
e. The Contractor shall use a configuration control system to control all changes to the Specification. The configuration control system shall be compatible with ISO 9001 (latest published version) or as specified in the Contract.