A Shipbuilding contract guarantee in respect of the (USD170m) final instalment for a USD200m drillship, given “absolutely and unconditionally” and “not merely as…surety” provided for payment “upon receipt…of…first written demand….” by the Builder. But in the event of a dispute over Buyer’s liability to pay, submitted to arbitration, the Guarantor was entitled to withhold payment pending the award. The CA, overturning the High Court judgment, ruled that this was a ‘demand’ guarantee (without reference to Buyer’s underlying liability) not merely a ‘see to it’ one and that the proviso operated only where the underlying liability arbitration had been commenced prior to the guarantee demand.