Okay, so you know how sometimes when you don't do something right or you forget to do something important, your parents might give you a timeout or take away your favorite toy? Well, sometimes they might charge you some extra money too.
The same thing happens with grown-ups and their money. Sometimes, if they don't pay their bills on time or they mess up something with their bank, the banks might charge them some extra fees. These extra fees are called default charges.
Recently, in the UK, there has been a controversy about these default charges because some people think they are too high. They think that the banks are charging too much money for things that might not even be the customer's fault.
So, some people are saying that there should be rules to make sure the banks can't charge too much for these default charges. They want the banks to be fair and not make it too hard for people who are already struggling with their money.