In the event that the Owner makes a precondition of any hire that payment of hire charges and any other amount in accordance with these conditions of hire is to be made by way of lodgement of blank cheque from the Hirer or alternatively the placement of a signed but incomplete credit card docket then the Hirer authorises and directs the representatives of the Owner to complete the cheque or credit card docket by filling in the amount of money owing for the period of hire pursuant to the terms stated in the conditions of hire agreement. Provided that the sum calculated and detailed on the cheque or credit card docket is in accordance with the terms and conditions of hire then the Hirer agrees that it will not dispute such sum or seek to cancel the payment of such sum.