# The Senedd Cymru Constituency Regulations 2025, Note: Explanatory note


(This note is not part of the Regulations)
The final determinations of the Democracy and Boundary Commission Cymru (“the Commission”) in respect of electoral arrangements for Senedd constituencies were published on 11 March 2025. These Regulations give effect to those determinations, in accordance with the Welsh Ministers’ powers, which are set out in paragraph 9(1) of Schedule 2 to the 2024 Act.
The Commission’s report determines the 16 Senedd constituencies made up of specific pairings of UK parliamentary constituencies, in keeping with the Commission’s duties under paragraph 2 and 8 of Schedule 2 to the Senedd Cymru (Members and Elections) Act 2024 (“the 2024 Act”).
The Welsh Ministers laid the Commission’s report before the Senedd, in accordance with paragraph 8(5) of Schedule 2 to the 2024 Act on 11 March 2025.
Regulations made in accordance with the Welsh Ministers’ powers as set out in paragraph 9(1) of Schedule 2 to the 2024 Act will not affect the return of a Member to the Senedd until the dissolution of the Senedd in connection with the first general election to be held after 6 April 2026 by virtue of paragraph 9(8) of Schedule 2 to the 2024 Act.
Paragraph 9(7) of Schedule 2 to the 2024 Act requires these Regulations to be laid before the Senedd as soon as is reasonably practicable after the regulations are made.
Regulation 1 sets out the title and coming into force of these Regulations. The commencement provisions give effect to the requirements of paragraph 9(8) of Schedule 2 to the 2024 Act.
Regulation 2 contains interpretation provisions for these Regulations.
Regulation 3 revokes two Orders: the Parliamentary Constituencies and Assembly Electoral Regions (Wales) Order 2006 (S.I. 2006/1041) and The Parliamentary Constituencies and Assembly Electoral Regions (Wales) (Amendment) Order 2011 (S.I. 2011/2987). These revocations have the effect of abolishing the previous Senedd constituencies.
Regulation 4 sets out and describes the Senedd constituencies into which Wales is now divided.
Regulation 5 requires each electoral registration officer to re-arrange or adapt the register of electors as necessary to give effect to these Regulations.
The Schedule contains the names, designations and composition of the Senedd constituencies.
The Welsh Ministers’ Code of Practice on the carrying out of Regulatory Impact Assessments was considered in relation to these Regulations. As a result, it was not considered necessary to carry out a regulatory impact assessment as to the likely costs and benefits of complying with these Regulations.

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Source: https://www.legislation.gov.uk/wsi/2025/709/note (the official version)
Page: https://openlegislation.uk/senedd-cymru-constituency-regulations-2025/note
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.