A clause in a guarantee precluding the guarantor from raising a defence, set-off or counterclaim while the guaranteed money remains unpaid prevents the guarantor from challenging the underlying debt on the basis that the creditor bank had knowledge of the debtor's fraudulent conduct. The guarantor's rights are suspended, not extinguished, and may be pursued after payment. A certificate clause providing that a certificate is 'sufficient evidence unless the matter or sum is proved to be false' establishes both the legal existence and the amount of the guaranteed debt. The presumption of regularity applies to powers of attorney under which certificates are executed, and the presumption is not displaced where the powers are not challenged in pleadings or cross-examination.
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