The OFT are indeed investigating
bank charges as opposed to credit card charges. There is no date set as yet for an announcement, and my personal opinion is that April would be too early to get a decision, as they only launched their investigation a couple of months ago, and they usually take a lot longer than 6 months to come up with their response. It may be that because their last one was announced in April 05, someone got their wires crossed?
It is likely, especially in view of the c/c statement, when the OFT advised that the principle could broadly be applied across all financial institutions (a statement which sent ripples of dismay through the banking industry), that the decision will fall more in less in line with the April 05 one.
However, don't forget that the OFT didn't "lower the charge to £12", as you state. They specifically said that £12 was NOT to be seen as an acceptable level, and that only a court could decide what constitutes a fair charge. They also said that £12 was the threshold above which they themselves would take legal action, but encouraged people to pursue their charges through the legal system if they were unhappy with the level of charges levied.
So all in all, business as usual. Until such time either a precedent has been set in court, or the banks lower their charges to a level which truly reflects the loss incurred through our breach of contract, (otherwise commonly known as "when Hell freezes over"), we keep going, nothing changes.

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Advice & opinions given by Bookworm are personal, are not endorsed by Consumer Action Group or Bank Action Group, and are offered informally, without prejudice & without liability. Your decisions and actions are your own, and should you be in any doubt, you are advised to seek the opinion of a qualified professional.