The Supplementary Vote (SV) is used for electing Mayors and Police and Crime Commissioners in the UK. With Supplementary Vote there are two columns of boxes alongside the candidates’ names on the ballot paper. One column of boxes is for voters to mark their favourite candidate with an X and one in which to mark a second favourite with an X. All the votes for favourite candidates are counted and if one candidate gets over 50% they are elected. If no candidate gets over 50%, the top two candidates continue to a run-off round and all other candidates are eliminated. The votes of everyone whose favourite candidate has been eliminated are moved to their second favourite. Votes from people who had their favourite candidate eliminated and their second favourite candidate is in the run-off, are added to their first-round totals for the two run-off candidates. The candidate with the most votes at this stage is declared the winner.