Hi - take a bit of time to read up first to make sure that you have the facts before going too far ahead. Read the FAQs and template letters then have a good read around here to see how others are getting on. Keep any progress on your own claim or questions that arise in a new thread in the forum for your bank to make it easier for others to follow and advise you. There's a set of links in my sig below that will help you find where all this useful information is. Well done for getting started!
Apologies for problems with the site - this is due to a software upgrade.
This practise is common among all banks and does lead to a convenient method to be able to charge more. As far as the OFT and £12 is concerned - firstly, the statement was only in connection with Credit Card accounts - and secondly, it was a guideline and not an acceptable limit. By making an unlawful charge the whole amount is in dispute, not just a portion of it.