British voters are showing few signs of “buyer’s remorse” at the decision to leave the EU made three months’ ago, one of the country’s leading polling experts has said.

Prof John Curtice, president of the British Polling Council, said there was little evidence of a “significant rethink” by voters despite the hopes of some pro-EU politicians.

During a briefing on public opinion and the referendum, Prof Curtice showed that twice as many people are currently opposed to a second EU referendum than back one.

Belief that Brexit will boost the NHS has plummeted by a third after the referendum, polling shows, despite the Eurosceptic campaign pledge to spend £350 million more on healthcare.