It came as Mr Banks, the subject of a National Crime Agency probe into the source of £8million of campaign funding in the run up to the Brexit vote, insisted the cash had not come from Russian Federation.
In turn, the Electoral Commission released its own statement confirming that they made the reference to the NCA over a £2 million (US$2.58 million) loan to BFTC, which ran Leave.EU, by Banks and his group of insurance companies.
The National Crime Agency probe was launched after the UK Electoral Commission said it had reasonable grounds to suspect that Mr Banks was not the true source of the cash.
Hundreds of internal emails leaked by former employees of Eldon Insurance and Rock Services to the paper show that despite categorical denials by Banks to MPs, insurance staff worked on the Leave.EU campaign from their company offices, although "any work carried out in the months before the referendum should have been declared under electoral law".
Challenged by Marr to explain where the money for his Brexit campaign came from, the millionaire businessman and self-style "bad boy of Brexit" again denied it came from overseas, saying instead it originated from his own United Kingdom businesses.
He said Rock Services had "all sorts of revenues", but did not detail them.
"The corruption I have seen in British politics, the sewer that exists and the disgraceful behaviour of the government over what they are doing with Brexit and how they are selling out, means that if I had my time again I think we would have been better to probably Remain and not unleash these demons", he said.
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Mr Banks was also asked about a report in the Sunday Times that he would back Remain if the 2016 referendum were re-run.
Mr Banks lashed out again at the Electoral Commission, accusing it of being full of his political opponents, as well as elements of the media who opposed Brexit. Asked why he had written to Mr Collins's constituents in Folkestone and Hythe, calling him a "snake in the grass", Mr Banks replied: "Well, he is".
The Electoral Commission is not responding to Mr Banks' comments.
Both Bilney and Banks deny any wrongdoing, with the latter posting a flurry of tweets on Friday evening.
It suspected Banks was not the "true source" of loans to the campaign and the money had come "from impermissible sources" - noting several meetings with senior Russian officials about gold mining.
The NCA investigation was immediately leapt upon by European Union loyalists, with Remain-supporting MPs and commentators claiming Brexit, officially scheduled for March 2019, should be delayed until the investigation is completed - echoing the demands of the American left with respect to Justice Brett Kavanaugh's appointment to the Supreme Court of the United States.