United Kingdom
| Year | Electoral system family | Electoral system for national legislature | Number of tiers | Legislative size (directly elected) | Legislative size (voting members) | Electoral system for the president |
|---|---|---|---|---|---|---|
| 2019 | Plurality/Majority | FPTP | 1 | 650 | 650 | Not applicable |
| 2017 | Plurality/Majority | FPTP | 1 | 650 | 650 | Not applicable |
| 2015 | Plurality/Majority | FPTP | 1 | 650 | 650 | Not applicable |
| 2010 | Plurality/Majority | FPTP | 1 | 650 | 650 | Not applicable |
| 2005 | Plurality/Majority | FPTP | 1 | 646 | 646 | Not applicable |
| 2001 | Plurality/Majority | FPTP | 1 | 659 | 659 | Not applicable |
| 1997 | Plurality/Majority | FPTP | 1 | 659 | 659 | Not applicable |
| 1992 | Plurality/Majority | FPTP | 1 | 651 | 651 | Not applicable |
