The account closure requires you to complete your complaint with All&Pester first. ie you need to continue your complaint until you get a letter that says "final decision" you then take it to the FOS. I am not sure if you will get compensation as a matter of course, but the more complaints go in the greater the chance that the FOS might actually decide to do their jobs!
Read the FAQS look at the template letters, understand the process, before you open up on them
There are plenty of threads on the issue of defaults, lots of reading for you
There are plenty of other things you can do to increase the pressure. Letter to your MP, complaint to the OFT re unfit to hold credit licence etc etc.
Not least of which of course is the joy in getting your money back from them


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Halicrap - Full settlement 12/06 £408.34
Crapitol 1 - Settled in Full 27/04/07 £1580
All & Pester - LBA sent for £3017
Woolsnitch mortgage accounts - Prelim £1687.50, LBA sent
Lloybles - Data Protection Act non disclosure, Information Commissioners Office ruling to comply