Britain is more committed to Brexit than it was at the time of the referendum, Downing Street has said after the founder of clothing firm Superdry donated £1million towards a second vote on leaving the EU.

Julian Dunkerton, the co-founder of Superdry, said that he was making the donation to the “People’s Vote” campaign because he saw a “genuine chance to turn this around”.

However Downing Street highlighted a poll in The Sun on Sunday which found that 15 per cent of Remainers have changed their minds, compared to 11 per cent on leavers.

Robbie Gibb, the Prime Minister’s Director of Communications, said: “1.9million Leave voters say they would now vote to Remain. But 2.4million Remain voters would now vote to Leave. The country hasn’t changed its mind.”

Theresa May has repeatedly ruled out a second referendum on Brexit, but there is growing support among Remain backing Tory and Labour MPs. Mr Dunkerton, who left Superdry earlier this year, told the Observer: "If Brexit had happened 20 years earlier, Superdry would never have become the global success that it did. We would have struggled to cope with negotiating customs and tariffs. Perhaps even more importantly, Europe was our staging post because inside the single market we had no fear of opening a store in France, Germany, Belgium or anywhere else."