Martin Lewis' MSE issues warning over banks' common service for customers
The regular newsletter from the team has signalled that many banks are now charging interest rates of 40 percent.
Martin Lewis issues advice on interest rates

The newsletter went on to explain how you can avoid forking out on a punishing overdraft interest rate, most obviously by switching to a bank offering a better deal.
However, they said people should first check that the new bank will offer them an overdraft with favourable terms.
If you owe less than £425, MSE said you could be "paid to switch" to First Direct. First Direct is currently offering £175 in free cash to bankers who switch to its 1st Account and the first £250 on its arranged overdraft is interest free.
The team added: "So if your overdraft's up to £425, the £175 pays some off and the rest is at 0 percent. Above that you'll pay 40 percent, like elsewhere."
MSE also explained how you could sign up for Nationwide's FlexDirect account which comes with a 0 percent overdraft up to a certain limit for a year, based on your credit history. After this, the standard 40% interest charge applies.
