| # | Years | Size | Links | |
|---|---|---|---|---|
| APNI | 2010–2015 | |||
| Birkenhead Social Justice | 2019–2019 | |||
| Change UK | 2019–2019 | |||
| Con | 1988–2019 | |||
| DUP | 1988–2019 | |||
| GPEW | 2010–2019 | |||
| Independent | 1990–2019 | |||
| Lab | 1988–2019 | |||
| LibDem | 1988–2019 | |||
| other | 1988–2014 | |||
| PlaidCymru | 1988–2019 | |||
| Referendum | 1997–1997 | |||
| Respect | 2005–2015 | |||
| SDLP | 1988–2017 | |||
| SDP | 1988–1991 | |||
| SNP | 1988–2019 | |||
| The Independents | 2019–2019 | |||
| UKIP | 2008–2017 | |||
| UKUP | 1995–2001 | |||
| UPUP | 1988–1995 | |||
| UUP | 1988–2017 |