Any 2nd ref would have to have 3 options and a single transferable vote
Remoan, Mays deal, Leeeaave.
If a persons first choice is the least favoured option (say remoan) then all votes for remoan go to the voters 2nd choice. Then we Leeeaave :)
(
CanonCaliber A big bore,
Tue 19 Mar 2019, 9:11,
archived)