Brexit legislation that passed into law earlier this month, "will need major surgery", adding that the 29 March Brexit day was a "gimmick" which had come "unstuck".
Theresa May has removed powers for negotiating Brexit from the Department for Exiting European Union and moved them to the Europe Unit in the Cabinet Office, headed by the prime minister's Europe advisor Olly Robbins.
"If that is designed in a way that works for businesses like ours and we really can take advantage of trade deals that the United Kingdom strikes then that's great, if it's not then it's true, we would have a trade policy in principle but not in practice".
Ireland's deputy prime minister said his government would back moves to lengthen the negotiating period by extending Article 50 if the United Kingdom government requested it, adding the deadline would only be extended if it was "necessary to get a sensible agreement".
Foreign Secretary Jeremy Hunt told reporters in Berlin after meeting German counterpart Heiko Maas that "there is now a very real risk of a Brexit no deal by accident".
"Without a real change in approach from the European Union negotiators, we do now face the real risk of a no-deal by accident and that would be incredibly challenging economically", he said.
According to the poll, 38% of people would vote for a new right-wing party that supports Brexit, while almost a quarter would support a clearly-expressed extreme right-wing, anti-immigrant and anti-Islamist party.
Huw Evans, the association's director general, said: "That is a perfectly plausible risk in the future, if no agreement is reached, in some countries of the European Union".
Amid anger from Brexiteers as what they regard as "Project Fear 2.0", one ally of the PM told the BBC's Newsnight: 'We want to scare people witless so people will eventually embrace the Theresa May plan'. Britain would find that challenging but in the end we would find a way not just to survive but to thrive economically.
This would address what he called "some of the tensions that were widely reported" in the previous structure of the government's Brexit officials, Raab said. She should negotiate the best way she knows how.
The poll found that one in three voters are prepared to back a new anti-Brexit centrist party.