The result of the general election will hinge on how many Labour supporters turn out, according to the founder of Ipsos Mori.
Sir Robert Worcester spoke to Sam Delaney a day before the general election and said: "What you’ve got to look at is whether those Labour supporters are going to turn out as much as the Tories are going to turn out.
"I’ve always said polls don’t forecast, they’re snapshots of time.
"I’ve been trying to get people to understand that the lead can be a very misleading figure. I always say watch the share, not the lead."
Worcester believes it is likely the Conservatives will get a majority in the general election and, although the pollsters have received heavy criticism in recent years, the exit polls will get the result right this time.
Listen to the full interview above