4. Terms of Payment (i) Payment in full shall be due on completion of the work and shall be made within 14 days of the date written application/invoice submitted by the Contractor. (ii) Where the Contract Period is in excess of 4 weeks, written applications/invoices may be submitted monthly for the total value of work executed – less previous payments – the net amount due to be paid by the Customer within 14 days (iii) Failure by the Customer to make payment within 14 day period last mentioned shall entitle the Contractor to suspend work and/or charge interest on the amount outstanding at 3 per cent above the Basic Rate of the Contractor’s Bank. 5. Completion The Contractor shall endeavour to carry out the work within the period stipulated or, if no period is stipulated, within a reasonable time, but shall not be held responsible for any loss or damage arising out of delay due to any cause beyond the Contractor's control.