A technical glitch has seen NatWest fail to pay interest on thousands of customer savings accounts and ISAs.
Customers logging into their online accounts this week were greeted with a message saying: "We are aware that monthly, quarterly and annual interest payments have not been applied to some savings accounts.
"This is being investigated as a priority and we'll update you with more information as soon as we can.
"In the meantime, you do not need to take any action - your account will be updated to the correct position and you will not lose out on any interest."
Customers took to Twitter to complain, although the tone was more tired resignation than anger: