Used in mayoral elections and police and crime commissioners (pre 2024). Two columns of boxes alongside candidates for voters to pick favourite and second favourite. If no candidate gets over 50% on first choice votes, second choice is added.
Advantages
+ Winner can claim overall majority so legitimate
+ Relatively simple
+ Voters can express support for more than one party
Disadvantages
- Only one candidate has ever won outright (2016, Kahn)
