Alyn and Deeside () was a constituency of the Senedd. It elected one Member of the Senedd by the first past the post method of election. Also, however, it was one of nine constituencies in the North Wales electoral region, which elected four additional members, in addition to nine constituency members, to produce a degree of proportional representation for the region as a whole.
The constituency had been represented by Jack Sargeant from February 2018 until its abolition in April 2026.
Boundaries
The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Alyn and Deeside Westminster constituency prior to the 2023 review of Westminster constituencies. It is entirely within the preserved county of Clwyd. For the 2007 Assembly election, there were minor changes to the constituency's boundaries. For Westminster purposes, the same boundary changes became effective at the 2010 United Kingdom general election.
When created in 1999, the North Wales region included the constituencies of Alyn and Deeside, Caernarfon, Clwyd West, Clwyd South, Conwy, Delyn, Vale of Clwyd, Wrexham and Ynys Môn (Anglesey).
From the 2007 election until 2026, the region included Aberconwy, Alyn and Deeside, Arfon, Clwyd South, Clwyd West, Delyn, Vale of Clwyd, Wrexham and Ynys Môn (Anglesey).
History The constituency had been held by Labour since its creation. The assembly member Carl Sargeant served as Cabinet Secretary for Communities and Children from 19 May 2016 until his resignation on 3 November 2017 following his suspension from the Labour Party due to "shocking and distressing" allegations about his personal behaviour. The seat was vacant following his death by suicide on 7 November 2017 and remained vacant until the by-election in the constituency took place on 6 February 2018, which was won by Carl's son Jack Sargeant for the Labour Party.
Voting In general elections for the Senedd, each voter had two votes. The first vote was used to vote for a candidate to become the Member of the Senedd for the voter's constituency, elected by the first past the post system. The second vote was used to vote for a regional closed party list of candidates. Additional member seats were allocated from the lists by the d'Hondt method, with constituency results being taken into account in the allocation.
Assembly Members and Members of the Senedd
ElectionMemberPartyPortrait 1999 Tom Middlehurst Labour 2003 Carl Sargeant 2018 Jack Sargeant
Elections Elections in the 2020s
Elections in the 2010s A by-election took place on 6 February 2018, following the death of incumbent AM Carl Sargeant.
Regional ballots rejected: 226
Elections in the 2000s
2003 Electorate: 60,518 Regional ballots rejected: 120
Elections in the 1990s
Notes and References
See also North Wales (Senedd electoral region) Senedd constituencies