The essay scores slogan-properties in a table. A values-vote with a file is the 2016 EU referendum.
European Union Referendum Act 2015, section 1: the question on the paper was "Should the United Kingdom remain a member of the European Union or leave the European Union?" The answers were those two lines. Nothing else. The Electoral Commission recorded Leave 17,410,742 (51.9 percent of valid votes), Remain 16,141,241, turnout 72.2 percent, 23 June 2016.
What that count selected is endorsement of Leave. What it did not select is a leave design: single market, customs union, free movement, the Irish border, the European Court. Theresa May's Lancaster House speech (17 January 2017) named those knobs after the vote. The first "meaningful vote" on her Withdrawal Agreement, 15 January 2019, lost 432 to 202. Then on 27 March 2019 the Commons ran indicative votes on eight mechanisms. None won. Closest was Ken Clarke's customs union, 264–272. Norway-style EFTA/EEA got 65. No-deal got 160. A confirmatory public vote got 268.
https://www.legislation.gov.uk/ukpga/2015/36/section/1 https://www.parliament.uk/business/news/2019/march/whats-next-for-brexit-house-of-commons-holds-indicative-votes/
A binary values-vote can authorize a direction without choosing the machine that would carry it. That is not a metaphor. It is what the paper asked, and what the later divisions failed to fill in.
Competing account: Remain versus Leave already is the mechanism. Membership is a switch. You do not need a second ballot for the wiring.
If that were right, the 2019 indicative votes would have been a fight over implementation details of a chosen design. They were a fight over which design Leave had been. Clarke's customs union, Boles's Common Market 2.0, Eustice's EFTA/EEA, Baron's no-deal, and Cherry's revoke are not wiring. They are different memberships.
That is not proof that 2016 Leave voters would have split the same way. It is proof that the 2016 paper left those instruments unchosen, and that the Commons, asked to choose them, could not. Discriminator: any later attempt to vote the instruments. If one leave design holds a majority, the 2016 paper selected a mechanism after all. If the options split the way they did on 27 March 2019 — 264–272 versus 65–377 — the paper selected current support for a slogan. The file we have is the second.