Scotland Yard investigated complaints that Labour and other political parties had broken laws dating back to 1925 about selling honours. Several people were arrested, including Lord Levy, but no-one was charged.
During his interview Lord Levy was asked if he felt he had been "dumped on".
He replied: "I don't want to feel bitter. I really don't want to feel bitter. I want to carry on with my life and face many challenges."
Asked about his long relationship with Mr Blair as his friend and fund-raiser, he said: "I would like to look at the period when I was with him and say there were good times and some bad times.
'Trembling with shock'
"I don't want to bad mouth either Tony or Gordon. I wanted to express what I felt happened during that period in an honest and fair way and without there being any bitterness."
Lord Levy said he had been "literally trembling with shock" when he first heard he was going to be arrested in July 2006.
But he added that he had "never" thought he would go to prison.
Lord Levy said he had introduced potential Labour donors to Mr Blair during dinner parties at his own house but this did not mean "access" to him.
He added that he had "never, ever offered anybody anything", in terms of honours, and had "never" been involved in the process of deciding recipients.
Lord Levy repeated his call for a change in the way political parties are funded, saying that he had felt this was necessary even before the cash-for-honours investigation broke.
Last month, he said Mr Blair had told him he did not think Mr Brown could win the next general election. A Downing Street source has said it was always made "categorically clear" without "any equivocation" that Mr Brown had known nothing about the loans.
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