Theresa May's party was unchanged on 45 per cent in the ICM poll for the Guardian, 11 points clear of Labour, which was up one on 34 per cent, while the Liberal Democrats were unchanged on 8 per cent and Ukip on 5 per cent.
Meanwhile, the latest findings from YouGov's modelling suggested a hung parliament, with the Conservatives on just 305 seats, down 25 from the 330 Mrs May's party had when she called the election.
New polls have only added to the confusion over voting intentions on Thursday
The constituency-by-constituency estimate, which draws on survey data and analysis of key demographics, previous voting behaviour and likely turnout, suggests Labour could win 268 seats.
The model indicated the Liberal Democrats would secure nine seats – the same number they had before the election – while the SNP would see their stranglehold in Scotland weakened, but still winning 42 seats.
The Tories have an 11-point lead over Labour
YouGov's update of its model includes 8,095 interviews conducted on June 4 as part of 53,609 interviews in the previous seven days, and put the Tories on 42 per cent, a four-point lead over Labour, with the Lib Dems on 9 per cent and Ukip on 3 per cent.
The latest Press Association's poll of polls – a rolling seven-day average of published surveys – put the Tories on 44 per cent with Labour on 37 per cent – the highest figure for Jeremy Corbyn's party since the campaign began.
Meanwhile, the latest findings from YouGov's modelling suggested a hung parliament Election 2017 LIVE Wed, May 31, 2017
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YouGov's update sees the Tories four points ahead of Labour
The Lib Dems were on 8 per cent, Ukip on 4 per cent and the Greens on 2 per cent.
:: ICM Unlimited interviewed a representative sample of 2,000 adults aged 18 or over online between June 2 and 4.