Following Mr Johnson's victory in the election, which he won on a promise to "get Brexit done", businesses have called on him to avoid no-deal.

They are concerned the UK could ditch the EU's trade agreements with the rest of the world before writing its own.

"The real work... starts now," said CBI director general Carolyn Fairbairn.

She told the BBC's Today programme that businesses were seeking reassurance that they would not face another "no-deal cliff-edge" Brexit.

As the outcome of the election became clear, the thoughts of business leaders would have immediately turned to Brexit, said the director general of the Institute of Directors, Jonathan Geldart.

"For directors, 'get Brexit done' will only have meaning once the details of our long-term future relationship with the EU are clear. They need a framework to plan for the future from," he said.

"The prime minister must resist the urge for arbitrary negotiating deadlines and should commit to a proper adjustment period that starts when businesses know the full detail of what changes they may be facing."

He said business bosses were more concerned about the "content and shape of any new deal" rather than simply the speed of agreeing terms.

'Level playing field'

The president of the European Council, Charles Michel, has indicated that the EU is willing to begin negotiating with Mr Johnson.

In a tweet, congratulating the prime minister on his election win, Mr Michel said: "We will negotiate a future trade deal which ensures a true level playing field."

And Donald Trump has said the UK would be free to strike a "massive" new trade deal with the US after Brexit.

"This deal has the potential to be far bigger and more lucrative than any deal that could be made with the EU," the US president tweeted.

Work on hammering out details of any future deal needs to begin as soon as possible, according to Stephen Phipson, the chief executive of manufacturers' organisation of Make UK.

"The first job is the urgent need to begin negotiations on our future trading relationship with Europe, cementing frictionless trade, access to key skills, regulatory alignment and space for business to prepare for new arrangements," he said.

"Manufacturing exports are one of the powerhouses of our economy and we must allow them to flourish."

'Tale of two halves'

Dyson director and former BMW board member, Ian Robertson, has called on the government to focus its energy on trade deals with countries around the world, such as Korea and Japan, as well as with the EU.

"It's really a tale of two halves," he told the Today programme.

"First of all the uncertainty is now gone and I think [it's] very good that we have a transition agreement already in place with the EU, so there is now a period of more stability looking in to 2020," he said.

"Having said that, the focus is now on getting a trade deal by the end of next year. That will be one of the major tasks of the new government."

He pointed to Mr Johnson's promise to "get Brexit done" and said: "Now it's get the trade deals done."

But Legal & General boss Nigel Wilson said the the uncertainty over a future trade deal would not deter investors from putting their money into the UK.

In fact, he said there was a "wall of money" wanting to invest in the country.

"We've had three and a half years to prepare for Brexit," he said, adding: "It's a pretty poor show if we haven't prepared."