Payment vouchers to be signed by Mayor, etc

A payment voucher shall not be cashed unless it bears the signature of the mayor and, where appropriate, of an officer of the Council to a certificate that– (a) the payment will not cause an excess on the amount approved for the subhead to be charged; (b) the expenditure has been authorized by the warrant quoted on the voucher; (c) the services have been duly performed, the prices charged are either according to contract or approved scales or are fair and reasonable; (d) the computations and castings, if any, have been verified and are arithmetically correct and the person named in the voucher is entitled to receive payment; and (e) all proper deductions from salaries on account of repayment of advances or other liabilities have been duly made.