Is there any research on by what date voters made their mind up about Brexit in the referendum campaign?

1 Answer 1


The largest Brexit exit poll I know of was released by Lord Ashcroft the day after the referendum. This online poll, conducted over the 21st-23rd of June (i.e. in the three days before the vote) interviewed 12369 voters. The third question asked (table 4 in the poll breakdown tables) asked "When did you finally decide how you were going to vote?". with responses of:

  • 10% : On polling day/ the day I filled out my postal vote
  • 8% : In the last few days
  • 6% : In the last week
  • 18% : In the last month
  • 14% : Since the beginning of the year
  • 6% : Longer ago than a year
  • 37% : I have always known how I would end up voting

There are some minor differences between remain and leave, but nothing spectacular or significant.

  • Wow! So all told, more than 40% of voters made up their minds less than a month before the referendum! That's a lot of "swing" votes. Commented Apr 4, 2019 at 3:36

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