See the press release and guidance:
Credit card default charges have generally been set at a significantly higher level than is legally fair, said the OFT today. The OFT estimates that across the industry this has led to unlawful penalty charges currently in excess of £300 million a year.
The OFT now expects all credit card issuers to recalculate their default charges in line with the principles set out in a statement published today and to take urgent action where needed to reduce the level of credit card default fees. The industry has until 31 May to respond to the statement. These principles also apply to default charges in other consumer contracts such as those for bank overdrafts, store cards and mortgages.
See the download: Calculating fair default charges in credit card contracts.
