Do you have the letters they sent you?
The debt handling might have been given to one of the debt collection agencies such as BCW, Stubbs,Cabot or Crossskerrys.
If it has,you can come to a debt repayment schedule with them,or pay the total in full.
Please note,if you are doing this to repair your credit rating,that the debt is only wiped from your ICB report 5 years after the loan is repaid.So if you agree to say 50 a month,you would still have a bad credit report for another 94 months.(might not apply to you,but might apply to someone else reading this).
If all the correspondence is still from some debt recovery division of Bank of Ireland...ring them!They'd be only too delighted to clear another bad loan off their books.