Boris Johnson has insisted he is not setting out an alternative vision for government after outlining plans to introduce an Australian-style points-based immigration system in the UK.
Speaking on a visit to the clothing factory of the uniform supplier Simon Jersey in Altham on the first day of a Vote Leave battle bus tour in Lancashire Mr Johnson rejected the idea he is making a pitch for a potential post-Brexit government.
He said: "All we are saying is what any government could do and we are saying after we vote leave on June 23 it will be up to the Government to take back control.
"Not just of immigration policy but obviously of huge sums of money, of our ability to set our economic and political priorities and to stop the situation where 60 per cent of the law going through the Palace of Westminster comes from the EU."
When pushed on whether he and his Brexiteer colleagues are setting out an an alternative vision for government he said: "The answer to that is no."
Mr Johnson, who was joined on the visit to the clothing factory by Government minister Priti Patel, said the immigration policy advocated by the Leave campaign would simply help politicians keep their promises.
"What we are saying is that politicians when they make their promises about reducing immigration would be able to keep those promises because at the moment they can't because of membership of the EU," he said.
"That's the crucial thing.
"If a government says that it's going to get numbers down to the tens of thousands which repeated promises have been made to that effect they would be able to deliver it."
Mr Johnson and Ms Patel were given a guided tour of the clothing factory and spoke to employees about their work which includes making the formal uniforms for Team GB athletes heading to Rio 2016.
Simon Jersey managing director James Saunders said Mr Johnson, who was wearing a blue linen jacket, had his "own sense of style".
"It's not what I'd have put him in," Mr Saunders said.
"We have got some great Simon Jersey products available in the catalogue that he could select any number of formal suits from.
"We'd probably put him in a nice Simon Jersey navy blue suit.
"Boris has got his own sense of style and I think he deserves credit for his own, personal sense of style."
Mr Johnson also insisted that he believes Mr Cameron will remain as prime minister regardless of the result on June 23.
He said: "Of course, there is no leader in Europe in the last 20 years who has stood down as the result of an adverse referendum."