An Opinium survey for the Observer appears to show support for the Tories has increased since Theresa May's surprise decision to call a snap general election.
Conducted on Wednesday and Thursday of last week, it puts the Conservatives on 45 per cent.
The figure is up seven points on the previous week and 19 ahead of Labour, who are down three points on 26 per cent.
If the voting pattern is repeated on polling day, it would put Mrs May on course for a comfortable victory on June 8.
The poll shows the Liberal Democrats are up four points on 11 per cent, leapfrogging Ukip which is down five on 9 per cent.
Opinium Research surveyed 2,003 UK adults aged 18 and over online between April 19 and 20.
Another poll showed Theresa May goes into the general election on June 8 with half of all voters backing the Conservatives
The ComRes poll for the Sunday Mirror puts support for the Tories at 50 per cent - double that of Labour, on 25 per cent.
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.
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.