Sankey diagrams
Sankey diagrams are used to visualise flows over time. In the case of this site, they're used to show how representation of individual constituencies flows from one general election to another, or how they're projected to flow. This helps to get a sense of
As Great Britain and Northern Ireland effectively have disparate sets of political parties, they are represented with separate flows. Only the relevant flow diagrams are shown - for example, most seat projections do not include projections for Northern Ireland, so the diagram for Northern Ireland is not shown when such a projection is selected.
Select one of the options below to see a Sankey diagram of how seat counts flowed (or are projected to flow) between parties.