A spokeswoman for the bank said it affects some customers who are expecting payments to arrive in their accounts on Monday.She said the money should appear in their accounts by the close of business, explaining that the problem was caused by a "delay in processing a file".A statement continued: "Bank of Ireland UK can confirm that some of our customers may have experienced a delay in receiving payments into their accounts."Payments due for posting on Monday 3 February can sometimes appear in customer's accounts on Saturday or Sunday. However on this occasion they will not appear in some customer accounts until close of business on Monday 3 February."This is due to a delay in processing a file."The bank added that any customers who have been affected by this issue, or who require access to funds sooner, should contact their branch directly.It said: "The Bank would like to apologise to any customers inconvenienced."