The Senedd Cymru (Members and Elections) Act 2024 (sometimes referred to as the Senedd Reform Act) is an
act of Senedd Cymru expanding and reforming the
Senedd
The Senedd ( ; ), officially known as the Welsh Parliament in English and () in Welsh, is the devolved, unicameral legislature of Wales. A democratically elected body, Its role is to scrutinise the Welsh Government and legislate on devolve ...
(Welsh Parliament; ) in
Wales
Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
. Provisions of the act include creating
sixteen larger constituencies, each electing six
members of the Senedd (MSs) by
proportional representation
Proportional representation (PR) refers to any electoral system under which subgroups of an electorate are reflected proportionately in the elected body. The concept applies mainly to political divisions (Political party, political parties) amon ...
.
The bill was introduced to the Senedd on 18 September 2023,
received
royal assent
Royal assent is the method by which a monarch formally approves an act of the legislature, either directly or through an official acting on the monarch's behalf. In some jurisdictions, royal assent is equivalent to promulgation, while in othe ...
on 24 June 2024, and the changes it makes to the Senedd's electoral system will be introduced in the
2026 Senedd election.
Background
The
Richard Commission report of 2004 suggested an increase in the number of Members to 80. That number was also suggested, as a minimum, by the 2014 report of the
Silk Commission.
Similarly, in 2013 and 2016, the
Electoral Reform Society
The Electoral Reform Society (ERS) is an Advocacy group, independent advocacy organisation in the United Kingdom which promotes electoral reform. It seeks to replace first-past-the-post voting with proportional representation, advocating the si ...
published reports making the case for enlarging the Assembly. A 2017 report of an expert commission led by
Laura McAllister suggested an increase to between 80 and 90 Members, switching to
single transferable vote
The single transferable vote (STV) or proportional-ranked choice voting (P-RCV) is a multi-winner electoral system in which each voter casts a single vote in the form of a ranked ballot. Voters have the option to rank candidates, and their vot ...
(STV) and enforcing
gender quotas. There was no cross-party consensus, however, on any of these measures in 2017.
As part of the
2021 co-operation agreement between
Welsh Labour
Welsh Labour (), formerly known as the Labour Party in Wales (), is an autonomous section of the United Kingdom Labour Party (UK), Labour Party in Wales and the largest party in modern Welsh politics. Welsh Labour and its forebears have won a p ...
and
Plaid Cymru
Plaid Cymru ( ; , ; officially Plaid Cymru – the Party of Wales, and often referred to simply as Plaid) is a centre-left, Welsh nationalist list of political parties in Wales, political party in Wales, committed to Welsh independence from th ...
, the parties agreed on an expansion of the Senedd to between 80 and 100 Members and a more proportional voting method, one that integrates gender quotas. Paragraph 22 also asked for recommendations to be made by the Special Purpose Committee by 31 May 2022, and aimed to pass legislation in the ensuing 12 to 18 months so that the it can be applied for the next election in 2026.
A Special Committee was set up on 6 October 2021, composed of five members representing each party, as well as the
Llywydd of the Senedd. They held public and private meetings on the issues. In May 2022, a joint position statement was published by
First Minister
A first minister is any of a variety of leaders of government cabinets. The term literally has the same meaning as "prime minister" but is typically chosen to distinguish the office-holder from a superior prime minister. Currently the title of ' ...
Mark Drakeford
Mark Drakeford (born 19 September 1954) is a Welsh politician who has served as Cabinet Secretary for Finance since September 2024, having previously held the position from 2016 to 2018. He previously served as First Minister of Wales and L ...
and Plaid Cymru Leader
Adam Price, and sent to the Special Committee. In it, they called for a 96-Member Senedd, all elected through
closed party list
Closed list describes the variant of party-list systems where voters can effectively vote for only political parties as a whole; thus they have no influence on the party-supplied order in which party candidates are elected. If voters had some in ...
proportional representation
Proportional representation (PR) refers to any electoral system under which subgroups of an electorate are reflected proportionately in the elected body. The concept applies mainly to political divisions (Political party, political parties) amon ...
(using the
D'Hondt method
The D'Hondt method, also called the Jefferson method or the greatest divisors method, is an apportionment method for allocating seats in parliaments among federal states, or in proportional representation among political parties. It belongs to ...
) with mandatory "
zipping" of male and female candidates in the list to ensure that for every party, half of the candidates will be women (unlike the voluntary
all-women shortlists used by the
Labour Party).
With a reduction in the number of Welsh MPs and new constituency boundaries being proposed for the next UK general election, the Senedd elections were proposed to be organised in 16 six-member regions created by pairing up the 32 redrawn Westminster constituencies.
The final report of the Special Committee was published on 30 May 2022 and recommended the system agreed to by the Labour and Plaid Cymru leaders.
Although the Expert Panel preferred the
single transferable vote
The single transferable vote (STV) or proportional-ranked choice voting (P-RCV) is a multi-winner electoral system in which each voter casts a single vote in the form of a ranked ballot. Voters have the option to rank candidates, and their vot ...
to any other method, the closed list PR system was favoured by the Committee over its capacity to enforce gender quotas through mandatory zipping, although the gender quotas rule was later abandoned.
The report was discussed in plenary session on 8 June 2022, and approved 40–15.
Further proposals
In February 2023, plans for additional reform included:
* Candidates must be resident in Wales
* A defection of an MS to another party is not permitted. An MS would instead have to become an independent.
* Independent candidates must disclose any party membership.
In September 2023, it was also proposed job sharing among Welsh Government ministers also be considered.
Opposition to the reforms
Welsh Conservatives have opposed the Senedd's expansion plan, which they fear would be costly, and have called for a referendum, arguing that only a public mandate can give legitimacy to such a reform.
In 2022 the sentiment was also expressed by the Conservative
UK Government
His Majesty's Government, abbreviated to HM Government or otherwise UK Government, is the central government, central executive authority of the United Kingdom of Great Britain and Northern Ireland. Welsh Secretary Simon Hart. His deputy, Conservative MP
David TC Davies, told his party conference that the reform plan would "lock in a Labour government forever" and "concentrate power in the hands of a few party managers".
On 10 May 2022, Conservative MS
Darren Millar
Darren David Millar (born 1976) is a Welsh politician who has served as the leader of the Welsh Conservatives since December 2024, and Member of the Senedd (MS) for Clwyd West since 2007.
Background
Millar was born and grew up in Towyn. Pol ...
, resigned from the Committee in disagreement to the Drakeford-Price joint statement, saying "Wales needs more doctors, dentists, nurses and teachers, not more politicians in Cardiff Bay".
The additional annual cost of the proposals was estimated as £17.8 million.
Provisions

On 18 September 2023, the Welsh Government published its plans for electoral reform as part of the proposed Senedd Cymru (Members and Elections) Bill.
The number of Senedd constituencies is set to fall to 16, which would be pairings of the proposed 32 constituencies in Wales for Westminster elections. Each constituency would elect six MSs from a closed list under the
D'Hondt method
The D'Hondt method, also called the Jefferson method or the greatest divisors method, is an apportionment method for allocating seats in parliaments among federal states, or in proportional representation among political parties. It belongs to ...
. Under the proposals, all candidates must live in Wales, and elections would take place every four years, rather than five. The first minister is proposed to have the power to appoint 17 rather than the current 12 ministers, plus the counsel general, to the Welsh Government, and the number of ministers could be increased to 18/19, pending further Senedd approval. There is also the addition of another deputy presiding officer.
The Bill was passed by a supermajority of MSs on 8 May 2024 with the entire Conservative Party voting against and every other party in favor.
The Bill did not take forward the proposals to enshrine a gender balanced Senedd in law amid doubts over the whether the Senedd has the power to pass such a law under the existing devolution settlement. These changes were eventually introduced in the Senedd Cymru (Electoral Candidate Lists) Bill on 11 March 2024, but abandoned in September 2024.
Constituencies

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Review:
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Initial proposals of 16 constituencies
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Revised proposals of 16 constituencies
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Final proposals of 16 constituencies
Notes
References
{{Welsh devolution, state=collapsed
Acts of Senedd Cymru
2024 in British law
2024 in Wales
2024 in British politics
Electoral reform in Wales
Constitutional laws of Wales
Election legislation