@Walter Hinteler,
The Southampton University-based Polling Observatory pointed out that the variation in the size of the lead among the pollsters from 10 to 12 points on ICM and Comres to 2 to 4 points on Yougov and Survation is almost wholly down to the different adjustments being applied for turnout, particularly among younger and poorer voters. Whistling in dark, maybe, but I have talked to a lot of young people who have told me they have registered to vote for the first time, specifically to vote Labour. May got booed by butchers when she went to speak at a meat market.
YouGov’s poll published on Wednesday (today) – which does not adjust for lower historic turnouts for younger and poorer voters – put Labour just four points behind on 38% to the Tories 42% which would leave May 24 seats short of an overall majority in a hung parliament. The extent to which youngsters and poorer voters turn out will decide where, between 24 seats short, and a 70 seat majority, the final result will be for the Tories.