The research gave the Tories an expected 48 per cent vote share, up one point from Survation’s previous snapshot last week while Labour was unchanged on 30 per cent.
The Lib Dems were up one point on 8% with Ukip unchanged on 4%, Survation said.
Conservatives build on HUGE lead over Labour
Data showed the NHS was the most important issue for voters, followed by Brexit, the economy and education.
The Tories were also on 48% in the latest ICM poll, down one point from last week.
Labour were up one point to 28%, with the Lib Dems also up one point to 10%. Ukip remained unchanged on 6%.
Survation interviewed 1,016 GB adults over the phone between May 12 and 13 while ICM interviewed 2,030 adults online from May 12 to May 14.
Data showed the NHS is the most important issue for voters
The latest polling in the race for the general election on June 8 was released as Labour was engulfed in a new furious new tax row yesterday.
Mr Corbyn’s party were accused of plotting swingeing tax rises yesterday.
Shadow health secretary Jonathan Ashworth also confirmed that the top rate of tax would be hiked from 45 per cent to 50 per cent by an incoming Labour government to raise more cash for the NHS.
“We will raise something in the region of £4.5billion form income tax changes,” the shadow health secretary said.
Mr Corbyn’s party were accused of plotting swingeing tax rises yesterday
And Tory housing minister Gavin Barwell warned that Labour plans for a hike in inheritance tax could hit many ordinary family homes in some parts of the country with higher property prices.
Labour chiefs are not denying the current threshold of £850,000 for the death duty would be slashed to £425,000 if Jeremy Corbyn reaches Downing Street.
Figures released by Mr Barwell showed that across England and Wales some 3.9million out of 25million would be dragged into the inheritance tax net as a result of the change.
“Under Corbyn, it will be pay as you earn and pay as you die,” Mr Barwell said.
Mrs May has started to roll out her manifesto pledges this week
Meanwhile, Mrs May last night unveiled plans for tackling the “injustice” of black and Asian workers earning less on average than their white counterparts.
Under a new Tory proposal, rules that force companies to publicly report any pay gap between male and female workers will be widened to include differences between ethnic groups.
The plans will also include the requirement to publish information on the pay gap at different grades of staff and age.
Mrs May said last night: “The fact that different ethnic groups are being paid less for doing the same jobs is an injustice which cannot be allowed in twenty-first century Britain.
“My plan will deliver a fairer deal for all workers, by extending rights and protections, guaranteeing rises in the National Living Wage and delivering a strong and stable economy.
“There is only one leader at this election who will put rights and opportunities for ordinary working families first.
“The choice next month is clear: economic stability and a better deal for workers under my Conservative team, or chaos under Jeremy Corbyn, whose nonsensical policies would trash the economy and destroy jobs.”
The move follows Mrs May bold attempt to move onto Labour’s policy territory by promising that, if the Tories return to power, her government will seek to increase employees’ rights.