You're absolutely right about the need to ask smart questions! Too many requests are made that never have any chance of eliciting a response. If I were doing it, I would send the letter below but obviously adapt it as you see fit.
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Dear Mr Fingleton,
Request for information under the Freedom of Information Act 2000
I am writing to you to request information about the recent investigation into credit card default charges and ongoing investigation into bank charges. This is a request under the Freedom of Information Act 2000 and I believe should not be subject to any of the qualified or absolute exemptions.
Investigation into credit card charges
(1) How many OFT staff and/or man-hours were dedicated to the credit card investigation?
(2) On what date was the decision made to begin an investigation into these charges? Who made that decision? Please supply the documentation that confirms this decision, redacting any information that you feel is exempt.
(3) Please explain why the decision was taken to investigate at that particular time. Please supply any documentation you personally received in this regard, redacting any information that you feel is exempt.
(4) On what date did the investigation begin?
(5) How many complaints did the OFT receive about credit card default charges in the 24 months prior to taking the decision to investigate? Please provide this by month or quarter, whichever is easier. If information for that period is not available, please supply the number of complaints over whatever period featured in your consideration.
(6) How many complaints did Consumer Direct receive about credit card default charges in the 24 months prior to taking the decision to investiage. Please provide this by month or quarter, whichever is easier. If information for that period is not available, please supply the number of complaints over whatever period featured in your consideration.
(7) How many complaints have been received by the OFT and Consumer Direct about credit card default charges since the OFT's announcement that £12 is the threshold for action? Of these, how many relate to charges in excess of that threshold?
(

The Unfair Contract Terms Regulations place a duty on the OFT to consider complaints it receives so please explain why it did not consider taking action sooner.
(9) Please give dates of meetings held during the course of the investigation and who attended. This is not a request for details of discussions at these meetings.
(10) Please give dates of correspondence between the OFT and those credit card lenders you were consulting with.
(11) Please provide any models used by the OFT to calculate that £12 should be the threshold for action. This is not a request for any information supplied by the credit card lenders to populate the model.
Should you choose to invoke either s35 or s44 of the Freedom of Information Act, this will be challenged. I believe none of the information requested would prejudice policy making and statistical information is not exempt once a decision has been taken. Part 9 of the Enterprise Act is not relevant either as I have not requested any market sensitive information or any information specfic to a particular credit card lender.
Investigation into bank charges
(1) How many OFT staff and/or man-hours have been dedicated to the bank charges investigation?
(2) On what date was the decision made to begin an investigation into these charges? Who made that decision? Please supply the documentation that confirms this decision, redacting any information that you feel is exempt.
(3) Please explain why the decision was taken to investigate at that particular time. Please supply any documentation you personally received in this regard, redacting any information that you feel is exempt.
(4) On what date did the investigation begin?
(5) How many complaints did the OFT receive about bank charges in the 24 months prior to taking the decision to investigate? Please provide this by month or quarter, whichever is easier. If information for that period is not available, please supply the number of complaints over whatever period featured in your consideration.
(6) How many complaints did Consumer Direct receive about bank charges in the 24 months prior to taking the decision to investiage. Please provide this by month or quarter, whichever is easier. If information for that period is not available, please supply the number of complaints over whatever period featured in your consideration.
(7) Please explain why you took the decision not to act on these complaints until now. The Unfair Contract Terms Regulations place a duty on the OFT to consider complaints it receives so please explain why it did not consider taking action sooner.
If you fail to provide the information requested then I will ask for an internal review. If I am unsatisfied with that response then I will make a complaint to the Information Commissioner and ask him to make a Decision Notice requiring the OFT to release the information.
Yours sincerely,
XXXXXXX
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What do you think? I really don't think it is worth going anywhere near asking for figures provided by the banks or asking any question that is anyway specific to a particular lender. I can't believe it will be answered and will only confuse the matter. My concern with my letter above is that it asks a lot of questions and could be exempted as costing too much to provide- don't think it would but you never know so it may be better either split the questions into two separate requests. If that exemption was used then I suppose it could just be resubmitted by someone else in manageable chunks?