4.1 If the Low Value Change is of a type listed in the Catalogue, the cost of carrying out that Low Value Change shall not exceed the relevant Catalogue Price and the time period for implementing the Low Value Change shall not exceed the relevant time specified in the Catalogue.
4.2 If the Low Value Change is not of a type that is listed in the Catalogue, the cost of carrying out that Low Value Change shall be calculated on the basis that:
4.2.1 wherever practicable the Low Value Change will be carried out by an [existing on-site and] suitably qualified employee of Project Co or a Project Co Party and in that case Project Co may not charge for labour. Where there is no such suitably qualified on-site employee reasonably available to carry out the Low Value Change, the cost of the labour element will be calculated in accordance with the Small Works and Services Rates or, where such rates are not applicable, in accordance with rates which are fair and reasonable; and
4.2.2 the materials element will be charged at the cost of materials to Project Co or to the Project Co Party carrying out the work (net of all discounts) and there shall be no management fee, margin, overhead, contingency or other cost applied in relation thereto.
4.3 Other than the costs referred to in paragraphs 4.1 and 4.2 of this Section 2 (Low Value Changes) Project Co may not charge the Authority for processing, implementing or managing a Low Value Change.