MP seat changes in Wales: New boundaries and constituency names to be used for first time

  • What will a major rejig in the different constituencies and a cut in the number of MPs look like? Mike Griffiths explains.


Welsh voters will take to the polls for the General Election with every constituency boundary in Wales but one changing and some of them having new names.

The number of Welsh MPs is being cut from 40 to 32 following a boundary review last summer.

The Boundary Commission for Wales reviewed the constituency boundaries, meaning several Welsh seats will vanish in their current form.

It all follows an earlier UK Government decision to ensure each constituency has a similar number of voters in it - between 69,724 and 77,062.

Because of that Wales will lose eight seats, as the country has some of the smallest constituencies in the UK.

Reviews have taken place in each of the four nations.

The boundaries of nearly all existing Welsh constituencies will be altered, with the exception of Ynys Môn, which has "protected status" and will have no changes to the island of Anglesey seat's name or boundaries.

Here are the new constituency names and boundaries for MP seats in Wales:

1. Aberafan Maesteg

Aberafan Maesteg joins together parts of four previous constituencies: Neath, Aberavon, Ogmore and Bridgend.

Aberafan Maesteg Credit: Parliament UK

2. Alyn and Deeside

Alyn and Deeside has its area enlarged.

Alyn and Deeside Credit: Parliament UK

3. Bangor Aberconwy

Bangor Aberconwy joins together parts of three previous constituencies: Arfon, Aberconwy and Clwyd West.

Bangor Aberconwy Credit: Parliament UK

4. Blaenau Gwent and Rhymney

Blaenau Gwent and Rhymney joins together parts of four previous constituencies: Merthyr Tydfil and Rhymney, Blaenau Gwent, Islwyn and Caerphilly. The bulk of the population for the new seat comes from the former Blaenau Gwent seat.

Blaenau Gwent and Rhymney Credit: Parliament UK

5. Brecon, Radnor and Cwm Tawe

Brecon, Radnor and Cwm Tawe is renamed from Brecon and Radnorshire and has its area enlarged.

Brecon, Radnor and Cwm Tawe Credit: Parliament UK

6. Bridgend

Bridgend joins together parts of two previous constituencies - Bridgend and Ogmore - with the bulk of the population coming from the former Bridgend seat.

Bridgend Credit: Parliament UK

7. Caerfyrddin

Caerfyrddin joins together parts of two former constituencies: Carmarthen West and South Pembrokeshire, and Carmarthen East and Dinefwr.

Caerfyrddin Credit: Parliament UK

8. Caerphilly

Caerphilly joins together parts of two former constituencies - Caerphilly and Islwyn - with the bulk of the population coming from the current Caerphilly seat.

Caerphilly Credit: Parliament UK

9. Cardiff East

Cardiff East joins together parts of two former constituencies: Cardiff Central, and Cardiff South and Penarth.

Cardiff East Credit: Parliament UK

10. Cardiff North

Cardiff North has its area enlarged, taking in some of the former Pontypridd seat.

Cardiff North Credit: Parliament UK

11. Cardiff South and Penarth

Cardiff South and Penarth joins together parts of three former constituencies, with the bulk of the population coming from the former Cardiff South and Penarth seat.

Cardiff South and Penarth Credit: Parliament UK

12. Cardiff West

Cardiff West has its area enlarged, taking in some of the Pontypridd constituency.

Cardiff West Credit: Parliament UK

13. Ceredigion Preseli

Ceredigion Preseli joins together parts of two former constituencies: Preseli Pembrokeshire, and Ceredigion.

Ceredigion Preseli Credit: Parliament UK

14. Clwyd East

Clwyd East joins together parts of four former constituencies: Clwyd West, Vale of Clwyd, Clwyd South and Delyn.

Clwyd East Credit: Parliament UK

15. Clwyd North

Clwyd North joins together parts of two former constituencies: Clwyd West and Vale of Clwyd.

Clwyd North Credit: Parliament UK

16. Dwyfor Meirionnydd

Dwyfor Meirionnydd joins together parts of three former constituencies: Dwyfor Meirionnydd, Arfon and Clwyd South.

Dwyfor Meirionnydd Credit: Parliament UK

17. Gower

Gower joins together parts of three former constituencies, with the bulk of the population coming from the former Gower seat.

Gower Credit: Parliament UK

18. Llanelli

Llanelli has its area enlarged to also take in some of the former Carmarthen East and Dinefwr seat.

Llanelli Credit: Parliament UK

19. Merthyr Tydfil and Aberdare

Merthyr Tydfil and Aberdare joins together parts of two current constituencies - Merthyr Tydfil and Rhymney, and Cynon Valley -with a very small part of the former Brecon and Radnorshire seat.

Merthyr Tydfil and Aberdare Credit: Parliament UK

20. Mid and South Pembrokeshire

Mid and South Pembrokeshire joins together parts of two former constituencies: Preseli Pembrokeshire, and Carmarthen West and South Pembrokeshire.

Mid and South Pembrokeshire Credit: Parliament UK

21. Monmouthshire

The bulk of the population will come from the former Monmouth seat, taking in some of the former Newport East seat.

Monmouthshire Credit: Parliament UK

22. Montgomeryshire and Glyndwr

The new Montgomeryshire boundary covers the former Montgomeryshire seat as well as some of the former Clwyd South seat.

Montgomeryshire and Glyndwr Credit: Parliament UK

23. Neath and Swansea East

The new Neath and Swansea East seat will take in much of the former Neath boundary and parts of what were Gower, Swansea East and Aberavon.

Neath and Swansea East Credit: Parliament UK

24. Newport East

The new Newport East boundary will take in much of the previous one, and some of the former Newport West boundary.

Newport East Credit: Parliament UK

25. Newport West and Islwyn

Newport West and Islwyn joins together much of what were the separate seats of the same names.

Newport West and Islwyn Credit: Parliament UK

26. Pontypridd

The new Pontypridd boundary takes in parts of what were the Pontypridd, Cynon Valley and Ogmore boundaries.

Pontypridd Credit: Parliament UK

27. Rhondda and Ogmore

Rhondda and Ogmore takes in what was the Rhondda seat, as well as some of Ogmore and Pontypridd.

Rhondda and Ogmore Credit: Parliament UK

28. Swansea West

The new Swansea West boundary takes in parts of the former Swansea East and Swansea West boundaries.

Swansea West Credit: Parliament UK

29. Torfaen

Torfaen has its area slightly enlarged, taking in a small part of the former Monmouth seat.

Torfaen Credit: Parliament UK

30. Vale of Glamorgan

The Vale of Glamorgan has had its boundary reduced slightly.

Vale of Glamorgan Credit: Parliament UK

31. Wrexham

Wrexham takes in the former seat boundary of Wrexham, also taking in some of the previous Clwyd South seat.

Wrexham Credit: Parliament UK

32. Ynys Môn

Ynys Môn's boundary remains unchanged.

Ynys Mon Credit: Parliament UK

You can find out more and view how your seat will be changing here.