Betfair's Katie Baylis said there was "no doubt" Labour was closing the gap in the polls, "which is a sentiment that's also being reflected in the odds".
When May called the snap June 8 election at the beginning of March, the Conservative Party led Labour by some 20 points in most opinion polls.
May was taunted by other party leaders for not attending a televised debate with them. However, a lacklustre campaign has seen Mrs May's lead drop dramatically.
A total of seven polls carried out since the May 22 Manchester attack have shown May's lead over the opposition Labour Party narrowing, with some suggesting she might not win the landslide predicted just a month ago. May now risks being ousted from Downing Street altogether.
It appears YouGov has made a decision to corner the United Kingdom election shock polls market by virtue of starting to publicise shock polls on a near daily basis that are successfully sending the mainstream media into a feeding frenzy as the seats forecasts are resulting in perceived tightening of the election race.
If May failed to win an overall majority, she would be forced to strike a deal with another party to continue governing either as a coalition or a minority government.
Martin Boon of ICM, whose Guardian poll on Monday which put the Tories on 45% and Labour on 33%, says that in fact the divergence in polling results has brought to a head the new methodological battleground in the polling industry.
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Often it is the least expected who star on a Lions tour, think back to Martin Johnson, who nobody knew on the 1993 campaign. Get more than one or two wrong, and the Lions will have little chance of beating New Zealand .
While only 12 percent of 18 to 24-year-olds said they would vote Conservative, 69 percent would vote for Corbyn.
The pollster's MRP model is based on the fact that people with similar characteristics tend to vote similarly, but not identically, regardless of where they live.
Britain's FTSE 100 ended its strongest month of the year on a quiet note on Wednesday as a choppy day for sterling, thanks to an increasingly cloudy picture painted by polls about next week's general election, gave investors little reason to chase the rally.
May, an opponent of exiting the European Union who won the top job in the political chaos following the shock June 23 Brexit vote, used a speech on Thursday in northern England to pitch her vision of Brexit.
As a result of the inquiry into the 2015 United Kingdom polling debacle, companies such as ICM and Comres now weight their voting intention figures for younger and less affluent voters by their actual turnout rates at previous elections.
"We shouldn't write off the thought that young people will turn out for this election (in large numbers) - but I think it's unlikely", Boon said.
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