A former mortgage broker is taking on the FSA without any legal representation as part of a £1.67m libel claim.
Adam Lucas, who ran People Loans between 2004 and 2007, claims the FSA has damaged his reputation by publishing a final notice against him for failing to pay fees and levies of £1,349.41.
He says: "I had relinquished my own permission well over a year before they think I did. I hadn't submitted the last three RMARs and it is well known if you don't submit one you have your permission taken away.
"In the decision notice, they said there wasn't a response to their warning notice, but there was. It is there in the court documents in black and white."
Lucas has launched a claim for £1.67m against the FSA - £215,000 for damage to reputation and the remainder for actual losses and future earnings.
He claims the publicity following the publication of the notice, which appeared across the financial media, has left his reputation in tatters.
He adds: "They have destroyed my career and I am not qualified to do anything else.
"I offered to mitigate my whole losses if they reversed their position but I was just met with institutional denial and arrogance all way through."
Although a preliminary hearing was due to be held on 4 April, it has now been pushed back until 20 May after the FSA asked for a two-and-half hour hearing.
Due to the prohibitive costs surrounding libel action, Lucas has chosen to represent himself at the Royal Courts of Justice as a litigant in person.
Lucas says his case will outline how the FSA demonstrated bad faith, malice, misfeasance in public office, breach of their statutory duties and breach of human rights.
He adds: "I offered to mitigate my whole losses if they reversed their position but I was just met with institutional denial and arrogance all the way through."
The FSA has previously argued the claim should "be struck out as an abuse of process" as Lucas is seeking an adjudication on the FSA's legally-backed decision.
The regulator denies the claim, which it says has no merit.
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