RBS, Natwest and Ulster Bank, all owned by RBS of course, are not having a great day today. Many thousands of customers are having trouble getting at their cash. A technical problem in the IT systems meant that people's bank balances were not updated over night. So customers trying to get money out of cash machines or use their debit cards, who would have expected wages or other money to be in their accounts this morning, have had their transactions turned down. RBS is working to get this sorted out as 'soon as is humanly possible' they say. It is very much a technical problem, and nothing to do with the safety of the bank.