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Five constituencies cover Dyfed, also used for elections to the Senedd. The current boundaries have been effective since the 2007 Welsh Assembly election and the 2010 United Kingdom general election.

Dyfed is one of the eight preserved counties of Wales, consisting of the principal areas of Pembrokeshire, Carmarthenshire and Ceredigion. These principal areas are also known as counties.

For Senedd elections, constituencies are grouped into additional member electoral regions.

Westminster boundaries

From 2010

Constituency	Boundaries
1. Carmarthen East and Dinefwr CC (Westminster)
2. Carmarthen West and South Pembrokeshire CC (Westminster)
3. Ceredigion CC (Westminster)
4. Llanelli CC (Westminster)
5. Preseli Pembrokeshire CC (Westminster)

  Conservative †   Labour ‡   Plaid Cymru ₪

1997 to 2010

Constituency	Boundaries
1. Carmarthen East and Dinefwr CC (Westminster)
2. Carmarthen West and South Pembrokeshire CC (Westminster)
3. Ceredigion CC (Westminster)
4. Llanelli CC (Westminster)
5. Preseli Pembrokeshire CC (Westminster)

Proposed boundary changes

The Boundary Commission for Wales submitted their final proposals in respect of the Sixth Periodic Review of Westminster Constituencies (the 2018 review) in September 2018. Although the proposals were immediately laid before Parliament they were not brought forward by the Government for approval. Accordingly, they did not come into effect for the 2019 election which took place on 12 December 2019, and which was contested using the constituency boundaries in place since 2010.

Under the terms of the Parliamentary Voting System and Constituencies Act 2011, the Sixth Review was based on reducing the total number of MPs from 650 to 600 and a strict electoral parity requirement that the electorate of all constituencies should be within a range of 5% either side of the electoral quota.

On 24 March 2020, the Minister of State for the Cabinet Office, Chloe Smith, issued a written statement to Parliament setting out the Government's thinking with regard to parliamentary boundaries. They propose to bring forward primary legislation to remove the statutory obligation to implement the 2018 Boundary Review recommendations, as well as set the framework for future boundary reviews in time for the next review which is due to begin in early 2021 and report no later than October 2023. It is proposed that the number of constituencies now remains at the current level of 650, rather than being reduced to 600, while retaining the requirement that the electorate should be no more than +/- 5% from the electoral quota.

Senedd boundaries

From 2007

Constituency	Senedd region	Constituency boundaries
1. Carmarthen East and Dinefwr CC (Senedd)	Mid and West Wales
2. Carmarthen West and South Pembrokeshire CC (Senedd)
3. Ceredigion CC (Senedd)
4. Llanelli CC (Senedd)
5. Preseli Pembrokeshire CC (Senedd)

The Mid and West Wales region also includes two Powys constituencies and one Gwynedd constituency.

1999 to 2007

Constituency	Assembly region	Constituency boundaries
1. Carmarthen East and Dinefwr CC (Assembly)	Mid and West Wales
2. Carmarthen West and South Pembrokeshire CC (Assembly)
3. Ceredigion CC (Assembly)
4. Llanelli CC (Assembly)
5. Preseli Pembrokeshire CC (Assembly)

Historical representation by party

A cell marked → (with a different colour background to the preceding cell) indicates that the previous MP continued to sit under a new party name.

1832 to 1859

  Conservative   Peelite   Radical   Whig

1859 to 1885

  Conservative   Liberal

1885 to 1918

  Conservative   Liberal   Liberal Unionist

1918 to 1950

  Coalition Liberal (1918-22) / National Liberal (1922-23)   Conservative   Independent Liberal   Independent Liberals (1931)   Labour   Liberal

1950 to 1983

  Conservative   Democratic   Independent   Labour   Liberal   Plaid Cymru

1983 to present

  Conservative   Labour   Liberal   Liberal Democrats   Plaid Cymru

See also

• List of parliamentary constituencies in Wales

Notes and references

References

1. The Parliamentary Constituencies and Assembly Electoral Regions (Wales) Order 2006, OPSI website
2. "Update: Strengthening Democracy:Written statement - HCWS183". UK Parliament. Retrieved 21 April 2020.

Notes

1. They are all county constituencies (CCs) of the House of Commons of the Parliament of the United Kingdom (Westminster)

• Lists of constituencies of the Parliament of the United Kingdom in Wales
• Dyfed