9 May:North Ayrshire, Kilwinning (2027). John Glover (Conservative) has died.
23 May:Melton, Wymondham (2027). Malise Graham (Conservative) has resigned.
30 May:Birmingham, Kingstanding (2026). Rick Payne (Independent, elected as Conservative) has resigned.
4 June:
Powys, Rhiwcynon (2027). Heulwen Hulme (Independent) has resigned.
6 June:North Lincolnshire, Axholme North (2027). John Briggs (Conservative) has died.
North Lincolnshire, Brumby (2027). Steve Swift (Labour) has died.
Telford & Wrekin, The Nedge (2027). Leanne Powers (Labour) has resigned.
Torbay, Wellswood (2027). Patrick Joyce (Prosper Torbay, elected as Conservative) has died.
13 June:
Greenwich, Mottingham, Coldharbour & New Eltham (2026). John Hill (Conservative) has died.
Highland, Tain & Easter Ross (2027). Alasdair Rhind (Highland Independent) has died.
West Dunbartonshire, Clydebank Central (2027). Craig Edward (Independent, elected as Labour) has resigned.
20 June:
Mid Devon, Tiverton Westexe (2027). Presumably it is Jamie Frost (Independent elected as Liberal Democrat), and that he's been disqualified for non-attendance
Countermanded elections from 2 May:Coventry, Radford (2024). Dave Anderson (TUSC Candidate) has died.
Known vacancies:
Argyll & Bute, Kintyre & The Islands (2027). Robin Currie (Liberal Democrat) has died.
City of London, Farringdon Within (2025). Graeme Doshi Smith (No description) has been removed from the list of councillors.
Chesterfield, Spire (2027). Peter Innes (Labour) has died.
Cumberland, Harraby North (2027). Cyril Weber (Labour) has died.
Doncaster, Town (2025). Jake Kearsley (Labour) has ceased to be a councillor.
Essex, Pitsea (2025). Luke Mackenzie (Conservative) has died.
Gosport, Grange & Alver Valley (2026). Maggie Morgan (Conservative) has died.
Hackney, Hoxton West (2026). Yvonne Maxwell (Labour) has resigned.
Mansfield, West Bank (2027). Ben Brown (Conservative) has resigned.
Na h-Eileanan Siar, Na Hearadh (2027). Grant Fulton (Independent) has been removed from the list of councillors.
Oxfordshire, Sutton Courtenay & Marcham (2025). Richard Webber (Liberal Democrat) has resigned.
Sefton, St Oswald (2027). Paula Spencer (Labour) has died.
Ribble Valley, St Marys (2027). Stewart Fletcher (Progressive Democrat, elected as Liberal Democrat) has resigned.
Vale of White Horse, Sutton Courtenay (2027). Richard Webber (Liberal Democrat) has resigned