The Chancellor praised the JP Morgan’s contribution to the UK economy during his visit to Bournemouth on Friday.

He said that “close to £1 trillion dollars” are traded in the Bournemouth centre every day.

Speaking to the Daily Echo, Mr Osborne said: “Bournemouth is a place with a great future.

“Unemployment has fallen by 50 per cent in the town, it has got all these digital businesses, it has got potential to be one of the great centres of the digital economy.

“We don’t want to see those jobs and that success in any way put at risk.”

He said Mr Dimon had been “very clear” about the consequences for financial services jobs in Bournemouth, and said access to European markets was a key element in the country’s success in international trade.

Mr Osborne also disagreed that the referendum campaign had been poorly undertaken by both sides, saying: “If you look at how the campaign has been conducted on the ground rather than just newspaper headlines you can see a really engaged audience.”

In his speech at JP Morgan on Friday the Chancellor said: “This country is not going to be asked to make a more important decision in our lifetime.

“The EU is a massive economic opportunity for Britain, a massive economic opportunity for our services industry.

“You can base your business here and can do banking and financial services across the EU, across a market of 500 million consumers.

“If we quit the EU there would be a big economic price to be paid. That is not just my view or the view of the Treasury but the view of almost every independent expert who has looked at this issue.”

Responding to a question, he added: “Every country that has ever been our ally and our friend is telling us not to quit the EU.”