Is there any research on when voters made their mind up in the Brexit referendum campaign?

Question

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

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.