[5] This litigation results from three agreements between the parties. There were two loan agreements, respectively described in the evidence as Mortgage 85 and Mortgage 86, which were entered into on 19 June 2001. Under Mortgage 85, the Oparas borrowed PLN 7,100,000 (approximately AUD 2,750,000), repayable in monthly instalments. That loan was secured against certain real property which they owned in Poland. Under Mortgage 86 they borrowed PLN 4,900,000 (approximately AUD 1,900,000) again repayable in monthly instalments. That was secured against certain other real property which they owned in Poland. The third transaction was one between the Bank and Dr Opara as the principal debtor and Mrs Opara as a guarantor. By that agreement, made on 16 October 2001 and which is described as the Securities Loan agreement, the Bank agreed to provide to Dr Opara a credit facility of up to PLN 30,000,000 (approximately AUD 11,750,000) for a period of one year. That limit was increased to an amount of PLN 50,000,000 (approximately AUD 19,500,000) by a variation agreed on 2 January 2002.