The Guardian that Mr Farage will now pay back £35,500 (€40,000) through having his salary withheld, after auditors concluded he had indeed misspent the funds.
LBC presenter Maajid Nawaz says he agrees with Nigel Farage that the United Kingdom needs a second EU Referendum and would be happy to campaign with him.
"Even putting aside the astronomical and completely unjustified public cost of a second referendum, Farage's comments are an open goal for the Remain camp", she wrote on the Brexit central website.
Despite quitting as leader of UKIP, Farage has kept a high profile and earlier this week met EU Brexit negotiator Michel Barnier in Brussels.
"That is how deep my distrust is for career politicians", he wrote. Do we stick with the view that the result will stand or acknowledge the fact that we face this potential threat?
He said "the percentage that would vote to leave next time would be very much bigger than it was last time round".
"And we may just finish the whole thing off and Blair can just disappear off into total obscurity".
Adrian Callaghan Daily Express
He said if there was a second referendum "we would win it hands down".
Tom Brake, Brexit spokesman for the Liberal Democrats, said: "Farage shouldn't be so confident of winning".
Sittingbourne and Sheppey MP Gordon Henderson said: "I have always been a great supporter and admirer of Nigel Farage but I am becoming slowly less warm now that he has become a caricature of himself to get attention".
On Thursday, a ComRes poll for the Daily Mirror newspaper of 1,049 adults showed that although more people think there should not be a second referendum (51 to 43 per cent), if there were to be a re-run, voters say they would opt to stay in the European Union by 55 to 45 per cent.
"To hold such a referendum would be to call into question the decisive importance of the largest democratic exercise ever held by this country", Bolton said.
Mr Bolton said UKIP's policy was to oppose a second referendum but Mr Farage had been making the point that the Leave camp needs to "unite" and "mobilise" to ensure Theresa May's government delivers Brexit.