Rhondda Cynon Taff: Mike Powell, who was elected as an Independent councillor for Trallwng ward and remains Leader of the RCT Independent Group, has joined the Green Party.
Scottish Borders: Mark Rowley, who was elected for the Conservatives in Mid Berwickshire ward, has left the party to sit as an Independent councillor.
West Berkshire: Adrian Abbs, who was elected for the Liberal Democrats in Newbury Wash Common ward but left the party in 2024, has formed the West Berkshire Residents group.
New vacancies
Barnet: Mill Hill ward, after the resignation of Independent councillor Laithe Jajeh, who was elected for the Conservatives. As his term would have ended on 10 May, no byelection follows.
Bradford: Idle and Thackley ward, after the death of Liberal Democrat councillor Jeanette Sunderland. Her term was due to end in May but she was a candidate for re-election.
Essex: Springfield division, after the death of Liberal Democrat county councillor Mike Mackrory. His term was due to end in May but he was a candidate for re-election.
Slough: Cippenham Green ward, after the resignation of Conservative councillor Robert Stedmond. Term ends 2027.
Corporation of London: The byelection due for a Common Councilman in the ward of Coleman Street will be held on 4 June.
Swansea: The byelection due in Fairwood ward will be held on 28 May.
Other updates
Bradford: The election due on 7 May in Idle and Thackley ward has been postponed following the death of Jeanette Sunderland, the incumbent Liberal Democrat councillor and candidate for re-election.
Essex: The election due in 7 May in Springfield division has been postponed to 18 June following the death of Mike Mackrory, the incumbent Liberal Democrat county councillor and candidate for re-election.
Harborough: At an extraordinary council meeting on Monday, a motion to remove the Liberal Democrat/Labour/Green Party/Independent coalition was carried by 17 votes to 16, and a Conservative council leader elected. A minority Conservative administration has been formed.
Melton: Following the resignation of the Labour council leader, the Labour/Independent coalition has been replaced by a Conservative/Independent one. The new leader was elected on the casting vote of the Mayor.
Tamworth: The election due on 7 May in Wilnecote ward has been postponed following the death of Sian Foster, who had been nominated as a candidate by the Labour Party.