Party unity
Parties ranked by how cohesively their MPs vote. Unity is the average voting agreement between every pair of the party's current MPs — how often two members of the same party recorded the same Aye or No vote. Parties with fewer than 5 MPs are excluded.
| Party | Unity |
|---|---|
| Green 5 MPs · 100% unity | 100% |
| SNP 8 MPs · 100% unity | 100% |
| LD 71 MPs · 99% unity | 99% |
| Con 117 MPs · 99% unity | 99% |
| DUP 5 MPs · 99% unity | 99% |
| Lab 43 MPs · 99% unity | 99% |
| Lab 360 MPs · 98% unity | 98% |
| RUK 7 MPs · 96% unity | 96% |
Methodology
Unity (voting agreement) is the average, across every pair of the party's current MPs, of how often the two recorded the same Aye or No vote in shared divisions. Each pair needs at least 50 shared comparable votes to count. It measures whether members vote the same way — not agreement on policy or motive.
Loyalty is the share of a party's comparable Aye/No votes cast with the party majority; rebellion is the inverse — votes against the party majority. Participation is recorded votes as a share of eligible divisions.
Independents and the Speaker are excluded as they take no party whip, and parties with fewer than 5 current MPs are excluded so a single member can't define a party's score.