reasonable endeavours to suggest and/or implement such new processes or procedures as may be deemed reasonable by SEV in the circumstances or as may be reasonably requested by DCL in order to ensure that the Maintenance Services are provided in an efficient and effective way. 3. Maintenance Charges 3.1 The Maintenance Charges shall be the aggregate charge during the continuance of this Agreement calculated calendar monthly in advance using the prevailing Fleet Size and the Maintenance Rate for each Vehicle included therein. 3.2 The Maintenance Charges shall not include the cost of any Excepted Services. 3.3 The Maintenance Charges shall be invoiced by SEV calendar monthly in advance and shall be payable by DCL within fourteen days of the invoice date. 3.4 SEV shall not be entitled to Maintenance Charges in respect of any Vehicle which is more than two weeks overdue for service inspection through no fault of DCL during the period from the week ending date when such inspection becomes two weeks overdue until the week ending date that the service inspection is duly carried out. DCL shall be entitled to receive a refund in respect of any such amounts that have already been paid and such refund to be made by credit note issued by SEV each week that the Vehicle remains overdue for service inspection. 3.5 Maintenance Charges shall be increased annually on the first day of each DCL Financial Year in line with the last published Retail Price Index and stated in Schedule One effective for the following year of this Agreement, a signed copy of which shall be attached to each copy of this Agreement. 3.6 Subject to a genuine dispute, SEV reserves the right to charge DCL interest in respect of the rate payment of any Maintenance Charges or Additional Charges due under