So, a poll comes out which sees Labour drop 10 points, and voila, seasonal workers are on their way back in.
I'm not sure how much detail of what's in those polls gets given to the parties in advance, but we can assume based on what happened next, that Labour had the tip off on one particular question.
The poll included a question about what more the Government could do.
The answer to which was: loosen up the borders a bit, more exemptions for seasonal workers.
And boom, look at that.