BRITAIN’S leading polling expert has predicted the Scottish Conservatives will not overtake Labour to become the main opposition party in the Scottish Parliament after next month’s election.

In an interview John Curtice, professor of politics at Strathclyde University, the one psephologist who forecast that the Tories would win an overall majority at last year’s General Election, suggested he did not believe they would beat Labour on May 5.

His remarks follow repeated statements by Ruth Davidson, the Scottish Conservative leader, that her party can and should replace Labour as Holyrood’s second party and main opposition to the SNP.

But Curtice suggested the chances of the Tories overtaking Labour next month are slim.

“The question is how far the Labour party can fall,” he said.

“We’re certainly not talking about a fundamental change in the popularity of the Tories. They are running towards the high end of what they’ve been at since 1977.”

The pollster whose reputation was enhanced because of the exit poll he oversaw for the BBC last May predicting a Tory win, said while he believed the SNP would win at May’s Holyrood election, there remained a “slight” doubt over whether it would be in a position to form a majority government.

“The SNP is going to win,” he told the Sunday Times, “There is at most a slight question as to whether they will absolutely, definitely get an overall majority.”

He added: “The SNP’s problem is that they can win an election, but they can’t guarantee to deliver independence. Meanwhile, the Unionists can’t win an election.”

Curtice said it was harder to forecast the outcome of the referendum on Britain’s membership of the European Union, which takes place on June 23, and he believed the campaign to remain in the EU faced a tough fight.

“Cameron’s renegotiation has had no impact,” he said.

“Even if it’s close to 60:40 (in favour of remaining), there’s a real fight on their hands.

“Certainly if the UK does vote to leave the EU, the implications for Scotland and Ireland would be pretty severe. I don’t think anybody could say what would happen.

“The balls would certainly be thrown up into the air and I’m not sure how they would land.”