Casnewydd Islwyn
Senedd constituency (from 2026)
From Wikipedia, the free encyclopedia
Casnewydd Islwyn (Welsh for 'Newport [and] Islwyn'; ⓘ) is a six-member constituency of the Senedd (Welsh Parliament; Welsh: Senedd Cymru) used in the 2026 Senedd election. It covers areas in the south-east of Wales, particularly parts of Caerphilly and Newport.
| Casnewydd Islwyn | |
|---|---|
| County multi-member constituency for the Senedd | |
Boundary of Casnewydd Islwyn in Wales | |
| Principal areas | |
| Preserved county | |
| Population | 220,058 (2024)[1] |
| Major settlements | Abercarn, Blackwood, Caerleon, Newbridge, Newport, Risca |
| Current County multi-member constituency | |
| Created | 2026 |
| Seats | 6 |
| Created from |
|
It was proposed following the 2026 review of Senedd constituencies, and is a pairing of the two UK Parliament constituencies of Newport East and Newport West and Islwyn. It has a Welsh-only name.
Boundaries
A Senedd constituency comprising the boundaries of the UK Parliament constituencies of Newport East and Newport West and Islwyn, has been proposed by the Democracy and Boundary Commission Cymru for the 2026 election to the Senedd (Welsh Parliament; Senedd Cymru). It was initially proposed using the name Newport and Islwyn in September 2024,[2] but was renamed to Casnewydd Islwyn in December proposals with most constituencies using Welsh-only names.[3] The Welsh-only name and boundaries were confirmed in the commission's final recommendations in March 2025.[4] When announcing their candidates, Reform UK used "Newport East, Newport West and Islwyn" instead, using the English names for the pair of UK Parliament constituencies that form it.[5]
It encompasses the entire of the principal area (county borough) of Newport and parts of Caerphilly County Borough in South Wales. The constituency was established in 2026, following the passing of the Senedd Cymru (Members and Elections) Act 2024. The act legislates electoral reform of the Senedd to create 16 larger "super constituencies", pairing the 32 UK Parliament constituencies in Wales, and using a new fully proportional voting system, with each constituency electing six Members of the Senedd (MSs) rather than one previously.[2]
Elections
Elections in the 2020s
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Natasha Asghar Toby Jones Jake Enea Georgina Webb Adam Morris Rebecca Nyasha Mamhende |
||||
| Green | Lauren James Phil Davies Zaynab Greengrass Kerry Vosper David Mayer Andrew Were |
||||
| Heritage | Mike Ford | ||||
| Labour | Jayne Bryant[6] Rhianon Passmore Chris Carter Rhian Howells Julie Sangani Stephen Marshall David Chinnick |
||||
| Liberal Democrats | Mike Hamilton[7] John Miller Nurul Islam Harun Rashid Mary Lloyd Jeff Evans |
||||
| Plaid Cymru | Peredur Owen Griffiths[8] Lyn Ackerman Rhys Mills Josh Rawcliffe Jonathan Clark Sarah Henton |
||||
| Reform | Dan Thomas Art Wright Marie-Claire Lea Nicholas Jones Rebecca Senior Tomos Llewellyn |
||||
| Open Party (UK) | Justna Muhith John Horan |
||||
| Independent | Taran Clayton | ||||
| Majority | |||||
| Turnout | |||||
| Registered electors | |||||
| win (new seat) | |||||
| 2021 notional result [a] | ||||
|---|---|---|---|---|
| Party | Vote | % | Seats | |
| Labour | 29,684 | 46.0 | 3 | |
| Conservative | 18,735 | 29.0 | 3 | |
| Plaid Cymru | 6,270 | 9.7 | 0 | |
| Independent | 3,334 | 5.2 | 0 | |
| Liberal Democrats | 2,430 | 3.8 | 0 | |
| Green | 1,314 | 2.0 | 0 | |
| Reform UK | 1,036 | 1.6 | 0 | |
| Abolish | 909 | 1.4 | 0 | |
| UKIP | 641 | 1.0 | 0 | |
| Freedom Alliance | 228 | 0.4 | 0 | |
Notes
- Estimate of the 2021 Senedd election result as if the revised boundaries recommended under the 2026 boundary review were in place