Election 2017 polls latest: How could turnout affect the UK election result?
The big differences in the latest polls are due to the different ways that pollsters estimate turnout among the younger generation.
The polls that give the Conservatives the smallest lead in the polls also happen to be the ones that predict more young people will vote.
For example, the new Survation poll showed that Labour has slashed the Conservatives' lead from 17 to just one point in month.
The poll, for Good Morning Britain, put the Conservatives at 41.5 per cent, just ahead of Labour on 40.4 per cent, with two days to go until the election.
In contrast the latest ICM poll, for the Guardian, found that the Conservatives still have an 11 point over Labour, pointing to an easy Tory victory.
Survation senior project manager Chris Hopkins said that the polls that give the Tories the largest lead are using turnout figures from 2015.
“We tend to believe there’s a slightly higher level of youth engagement,” he said. “Our two last polls both show a one point Conservative lead.”
Young voters are seen as less likely to vote, compared to older votes. But the younger generation may have been energised by the EU referendum last summer.
New figures, from City firm FTI Consulting, suggest Labour’s supporters remain less likely to show up on polling day.
The firm found that while 93 per cent of Conservative voters said they would definitely vote, just 88 per cent said the same for Labour.
FTI head of research Dan Healy told City AM said: “There are very clear parallels in the voter base for Clinton, the Remain in the EU and Labour.
“All polled strongly leading up to the day of judgement, but arguably failed to emotionally engage supporters to command their motivation to actually vote on the day.
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“Adding to this, all attracted a relatively young voter base and once again we’re looking at them being significantly distracted from voting.”
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In 2015, turnout across the UK was 66 per cent but turnout just over 71 per cent in Scotland. Turnout in Scotland could help to decide the election this time.
Anthony Wells, director in the YouGov political and social research team, said differences between the polls are “almost wholly to do with how pollsters treat turnout”.
He added: “Generally speaking, the polls that continue to show a large Conservative lead are those who are basing their turnout models on the pattern of turnout in 2015.
“Those that show smaller leads are basing turnout on how likely people say they are to vote.”