Casnewydd Islwyn
| 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 |
|
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.
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]
Members of the Senedd
| Term | Election | Distribution | MS | MS | MS | MS | MS | MS | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7th | 2026 |
|
Dan Thomas (Ref) |
Peredur Owen Griffiths (PC) |
Art Wright (Ref) |
Lyn Ackerman (PC) |
Jayne Bryant (Lab) |
Natasha Asghar (Con) | ||||||||||
Elections
Elections in the 2020s
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Reform | Dan Thomas (E) Art Wright (E) Marie-Claire Lea Nicholas Jones Rebecca Senior Tomos Llewellyn |
25,571 | 32.9 | +31.3 | |
| Plaid Cymru | Peredur Owen Griffiths (E)[6] Lyn Ackerman (E) Rhys Mills Josh Rawcliffe Jonathan Clark Sarah Henton |
23,069 | 29.7 | +20.0 | |
| Labour | Jayne Bryant (E)[7] Rhianon Passmore Chris Carter Rhian Howells Julie Sangani Stephen Marshall David Chinnick |
10,622 | 13.7 | −32.3 | |
| Conservative | Natasha Asghar (E) Toby Jones Jake Enea Georgina Webb Adam Morris Rebecca Nyasha Mamhende |
8,847 | 11.4 | −17.6 | |
| Green | Lauren James Phil Davies Zaynab Greengrass Kerry Vosper David Mayer Andrew Were |
5,898 | 7.6 | +5.6 | |
| Liberal Democrats | Mike Hamilton[8] John Miller Nurul Islam Harun Rashid Mary Lloyd Jeff Evans |
2,683 | 3.5 | −0.3 | |
| Open Party (UK) | Justna Muhith John Horan |
435 | 0.6 | New | |
| Heritage | Mike Ford | 349 | 0.4 | New | |
| Independent | Taran Clayton | 224 | 0.3 | −4.9 | |
| Majority | 2,502 | 3.2 | |||
| Turnout | 77,698 | ||||
| Registered electors | |||||
| Reform win (new seat) | |||||
| Reform win (new seat) | |||||
| Plaid Cymru win (new seat) | |||||
| Plaid Cymru win (new seat) | |||||
| Labour win (new seat) | |||||
| Conservative win (new seat) | |||||
| 2026 result | ||||
|---|---|---|---|---|
| Party | Vote | % | Seats | |
| Reform UK | 25,571 | 32.9 | 2 | |
| Plaid Cymru | 23,069 | 29.7 | 2 | |
| Labour | 10,622 | 13.7 | 1 | |
| Conservative | 8,847 | 11.4 | 1 | |
| Green | 5,898 | 7.6 | 0 | |
| Liberal Democrats | 2,683 | 3.5 | 0 | |
| Open Party | 435 | 0.6 | 0 | |
| Heritage | 349 | 0.4 | 0 | |
| Independent | 224 | 0.3 | 0 | |
References
- ↑ "Data for the Senedd Cymru constituency areas: 2026". gov.wales. 20 March 2026. Retrieved 19 April 2026.
- 1 2 Hayward, Will (2 September 2024). "The full details of Wales' 16 new constituencies for Senedd elections". Wales Online. Retrieved 28 February 2025.
- ↑ "Proposed Senedd constituency names divides opinion". ITV News. 17 December 2024.
- ↑ Price, Emily (11 March 2025). "New Senedd 'super constituencies' confirmed". Nation.Cymru. Retrieved 11 March 2025.
- ↑ Mosalski, Ruth (25 March 2026). "Reform UK got the names of all the new Senedd constituencies wrong". Wales Online. Retrieved 26 March 2026.
- ↑ "Candidates". Plaid Cymru. Retrieved 24 February 2026.
- ↑ Green, Daniel (2 December 2025). "Senedd elections 2026: Who are Welsh Labour's candidates?". LabourList. Retrieved 6 January 2026.
- ↑ "Casnewydd Islwyn". Welsh Liberal Democrats. Retrieved 7 January 2026.