A secured creditor who proves for the whole of its debt in a winding up without valuing or surrendering its security, and then accepts and banks a dividend cheque calculated on the whole debt, will be deemed to have elected to surrender the security by operation of law, regardless of the creditor's subjective intention. Conduct of the creditor unknown to the liquidator (such as continuing efforts to sell the mortgaged property) cannot displace the deemed election. The question whether the doctrine of mistake can relieve against a deemed election remains open.
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