Nigel Farage has admitted he has "absolutely no idea" what will happen if Britain votes to Leave the European Union next week.
The Ukip leader said his party's MEPs, of which he is one, would act as the "canary in the mine shaft" in the European Parliament if the British Government failed to act upon a Leave vote by the British people.
Mr Farage was speaking during a walkabout with supporters in the London borough of Kingston-upon-Thames.
He arrived clutching a copy of Tuesday's Sun newspaper, which announced its support for leaving the EU on its front page.
Mr Farage said he was "absolutely thrilled" and "over the moon" with the newspaper's decision.
Arriving in Kingston aboard his bright purple Brexit battlebus, to the theme tune of The Great Escape, Mr Farage, flanked by five security guards, posed for selfies, exchanged handshakes and even signed one supporter's car.
He also accepted a £5 note from another supporter, who offered it on the condition he "bought himself a beer".
Polls in recent days have shown a rise in support for Leave, but Mr Farage warned that any Brexiteer who thought they had it in the bag was a "fool".
A YouGov poll for The Times put Leave seven points ahead on 46%, with Remain on 39%.
And a pair of ICM polls for The Guardian - one carried out by telephone, the other online - has Leave ahead by 53% to 47%, if the "don't knows" are excluded.
Mr Farage admitted he had "absolutely no idea" what would happen after June 24 if the polls proved correct, but said the effect on British politics could be "very profound".
He added: "Here we are, with nine days to go. I'm not contemplating anything afterwards, Nothing. I just want to win this referendum.
"And then we'll have a sit down and a think about where we all go. But I think, potentially, the effects of this referendum on the Conservative Party, the Labour Party, Ukip, could be very profound. We could see a big reshaping."
During the campaign stop, Mr Farage carried out a trademark pose with his passport, telling supporters he wanted to declare June 23 "UK Independence Day".
Asked his opinion of former British prime minister Gordon Brown's intervention on Monday urging people to vote to remain in the EU, Mr Farage said he thought it would further "widen the gap" between the Labour Party and its supporters.
He said: "I've been to the real Labour heartlands in this country and, let me tell you, the Labour Party is utterly disconnected with a very large chunk of its roots."
As he left Kingston, Mr Farage posed for a photograph with former SNP voter Duncan Calderwood, an IT engineer originally from Kilmarnock.
Mr Calderwood, 31, said he had switched his allegiance from the SNP to Ukip just before the Scottish referendum in 2014 because he trusted the Ukip leader.
"He's controversial but honest," said Mr Calderwood.
The visit to the town centre was largely positive for the long-time EU critic, although chants of "Three cheers to Nigel" were briefly overshadowed by two passers-by who shouted "Racist" at Mr Farage as he departed on his battlebus.