The respondent sued the appellant bank in conversion after a fraudulent employee deposited $4,000,000 in forged cheques into accounts at the bank.
The appellant sought to amend its statement of defence to plead estoppel by negligence, arguing the respondent was negligent in failing to detect the fraud.
The Court of Appeal upheld the lower courts' refusal to allow the amendment, confirming that conversion is a strict liability tort and that recognizing a new duty of care or a defence of estoppel by negligence would inappropriately alter the allocation of risk in the banking system.
The appeal was allowed only to the extent of permitting the appellant to plead defences arising from the respondent's actual knowledge of the fraud.