Theresa May could come into the General Election on June 8 with a 50 per cent lead, according to an opinion poll.

The Sunday Mirror poll, carried out by ComRes, put support for Labour at just 25 per cent, half that of the Conservatives.

The polling company said it was the first time any political party has achieved 50 per cent support since April 2002 - and the first time the Tories have reached that mark since January 1991.

A poll for the Sunday Mirror predicts the Conservatives could have a 50 per cent lead in the General Election, the first time any political party has achieved that level of support since April 2002

The survey showed support for the Conservatives has strengthened since the Prime Minister's decision to call a snap election - rising four points on the previous week - while Labour was unchanged.

The Liberal Democrats are also unchanged on 11 per cent while Ukip are down two points on 7 per cent.

But even though the poll predicts the Conservatives will win comfortably, others predict a much tighter race.

What the polls say Conservative Labour Liberal Democrats UKIP Mail on Sunday (Survation) 40% 29% 11% 11% Sunday Times (YouGov) 48% 25% 12% 5% Observer (Opinium) 45% 26% 11% 9% Sunday Mirror (ComRes)

50% 25% 11% 7% Sunday Express (Norstat) 42% 26% 10% N/A

A Survation poll for The Mail on Sunday showed the gap was significantly closer with the Conservatives on 40 per cent - 11 points ahead of Labour on 29 per cent.

The Lib Dems and Ukip were tied on 11 per cent.

Survation carried out its field work later than the others - interviewing 2,070 adults online on Friday afternoon and Saturday - as the row was breaking over the Conservatives' tax and pension plans.

An Opinium survey for The Observer also gives the Conservatives a commanding lead with 45 per cent - up seven points on the previous week and 19 ahead of Labour, who are down three points on 26 per cent.

The poll shows the Liberal Democrats are up four points on 11 per cent, leapfrogging Ukip, which is down five on 9 per cent.

A Survation poll for The Mail on Sunday showed the gap was significantly closer with the Conservatives on 40 per cent - 11 points ahead of Labour on 29 per cent

ComRes chairman Andrew Hawkins said the strength of the Tory lead could pose a problem for the party with the threat of complacency among Conservative supporters who may not turn out to vote.

'While no political party could ever object to breaching the 50 per cent barrier for the first time this century, this spectacular headline result masks a real danger for the Tories,' he said.

Could Labour be wiped out in Scotland? Scottish polls predict the Conservatives could become the second most popular political party as Labour are pushed out. A Sunday Times poll will be announced later tonight, which predicts Labour will win no seats in the June election. The Panelbase poll also found the Conservatives could win 12 seats in Scotland. A Survation poll for the Sunday Post put the Conservatives at 27.9 per cent, while the SNP is on 43.1 per cent. Labour are on 17.8 per cent and support for the Liberal Democrats is 8.8 per cent. Advertisement

'That is a nice problem for a party to have, but it is nonetheless a particular challenge in an election which may well be marked by low turnout and thus bring about some unpredictable and possibly surprising individual constituency results.'

YouGov for The Sunday Times also has the Conservatives well ahead on 48 per cent - a 23-point lead over Labour on 25 per cent.

The Lib Dems are on 12 per cent while support for Ukip is just 5 per cent - the party's lowest rating in a YouGov poll since March 2012.

However, a Survation poll for The Mail on Sunday showed the gap was significantly closer with the Conservatives on 40 per cent - 11 points ahead of Labour on 29 per cent. The Lib Dems and Ukip were tied on 11 per cent.

Survation carried out its field work later than the others - interviewing 2,070 adults online on Friday afternoon and Saturday - as the row was breaking over the Conservatives' tax and pension plans.

A Norstat poll in the Sunday Express put support for the Conservatives at 42 per cent, 16 points ahead of Labour on 26 per cent.

10 per cent of those polled said they would vote for the Liberal Democrats.

After the pollsters failed to predict the Conservatives' victory in the 2015 election, the latest results are likely to add to wariness among politicians in placing too much weight on their findings.