Casnewydd Islwyn

Casnewydd Islwyn (Welsh for 'Newport [and] Islwyn'; ) is a six-member constituency of the Senedd (Welsh Parliament; Welsh: Senedd Cymru) to be used for the 2026 Senedd election. It would cover areas in the south-east of Wales, particularly parts of Caerphilly and Newport.

Source: Wikipedia

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Casnewydd Islwyn

It was proposed following the 2026 review of Senedd constituencies, and will be a pairing of the two UK Parliament constituencies of Newport East and Newport West and Islwyn. It is to have a Welsh-only name.

Boundaries

Casnewydd Islwyn

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, but was renamed to Casnewydd Islwyn in December proposals with most constituencies using Welsh-only names. The Welsh-only name and boundaries were confirmed in the commission's final recommendations in March 2025. 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.

It encompasses the entire of the principal area (county borough) of Newport and parts of Caerphilly County Borough in South Wales. The constituency is to be established by 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.

Elections

Elections in the 2020s

<table><thead><tr><th>Party</th><th>Candidate</th><th>Votes</th><th>%</th><th>±%</th></tr></thead><tbody><tr><td></td><td>Conservative</td><td>Natasha Asghar Toby Jones Jake Enea</td><td></td><td></td><td></td></tr><tr><td></td><td>Green</td><td>Rachel Roberts</td><td></td><td></td><td></td></tr><tr><td></td><td>Heritage</td><td>Mikę Ford</td><td></td><td></td><td></td></tr><tr><td></td><td>Labour</td><td>Jayne Bryant Rhianon Passmore Chris Carter Rhian Howells Julie Sangani Stephen Marshall David Chinnick</td><td></td><td></td><td></td></tr><tr><td></td><td>Liberal Democrats</td><td>Mike Hamilton John Miller Sarah Lockyer Nurul Islam Harun Rashid Mary Lloyd Jeff Evans</td><td></td><td></td><td></td></tr><tr><td></td><td>Plaid Cymru</td><td>Peredur Owen Griffiths Lyn Ackerman Rhys Mills Josh Rawcliffe Jonathan Clark</td><td></td><td></td><td></td></tr><tr><td>Majority</td><td></td><td></td><td></td></tr><tr><td>Turnout</td><td></td><td></td><td></td></tr><tr><td>Registered electors</td><td></td><td></td><td></td></tr><tr><td></td><td>win (new seat)</td></tr></tbody></table>

<table><thead><tr><th>2021 notional result</th></tr></thead><tbody><tr><td>Party</td><td>Vote</td><td>%</td><td>Seats</td></tr><tr><td></td><td>Labour</td><td>29,684</td><td>46.0</td><td>3</td></tr><tr><td></td><td>Conservative</td><td>18,735</td><td>29.0</td><td>3</td></tr><tr><td></td><td>Plaid Cymru</td><td>6,270</td><td>9.7</td><td>0</td></tr><tr><td></td><td>Independent</td><td>3,334</td><td>5.2</td><td>0</td></tr><tr><td></td><td>Liberal Democrats</td><td>2,430</td><td>3.8</td><td>0</td></tr><tr><td></td><td>Green</td><td>1,314</td><td>2.0</td><td>0</td></tr><tr><td></td><td>Reform UK</td><td>1,036</td><td>1.6</td><td>0</td></tr><tr><td></td><td>Abolish</td><td>909</td><td>1.4</td><td>0</td></tr><tr><td></td><td>UKIP</td><td>641</td><td>1.0</td><td>0</td></tr><tr><td></td><td>Freedom Alliance</td><td>228</td><td>0.4</td><td>0</td></tr></tbody></table>