How this works: Drag a dial up to grow that party's vote from its 2022 level. New votes come proportionally from Conservative and Labour — Lib Dem growth 60/40 Con/Lab; Green 40/60; Reform 80/20. Each party can also motivate new voters: calibrated so that if all three parties hit their maximum, local turnout rises from its 45% baseline to the 70% seen at the last general election. Stated assumptions, not hidden ones. Illustrative only.