Not sure if this is the correct place for this.....
Most of us have bank accounts and credit cards and have probably been charged at some point for going over their limit or being overdrawn etc.
Basically any charge your bank levies on you is deemed unlawful and can be claimed back.
This has been in the news and on watchdog recently and you are entitled to claim back all charges on your account for the last 6 years.
The above sites forum has all the info and letter templates needed to do this.
You could possible be owed hundreds if not thousands in some cases.