The Office of Fair Trading (OFT) will say later today if it is going to continue its test case against banks over the fairness of their overdraft charges. It follows the banks’ successful appeal on the issue to the Supreme Court. It ruled last month that the OFT could not use a part of the unfair consumer contract regulations to decide if bank charges are fair. The ability of banks is at stake to levy charges amounting to £2.6bn each year on their overdrawn customers. The announcement, the OFT’s first detailed response to the Supreme Court judgement, is expected at 7.00am this morning.