Hartlepool: John Tennant, who was elected for the UK Independence Party in Jesmond ward, and has since been a member of the Brexit Party and of the local Independent Union group, has now joined Reform UK.
Surrey: Guildford East division, after the disqualification of Conservative county councillor Graham Ellwood who did not attend any council meetings in six months. His term would have ended in May so no byelection will be held.
Test Valley: Andover Millway ward, after the resignation of Andover Alliance councillor Alison Watts. Term ends 2023.
Thanet: Dane Valley ward, after the resignation of Thanet Independents councillor Gary Taylor. Term ends 2023.
Wolverhampton: Blakenhall ward, after the resignation of Labour councillor John Rowley. His term was extended to May so no byelection will be held.
Wolverhampton: Bushbury North ward, after the resignation of Labour councillor Hazel Malcolm. She had her term extended to May and will not be replaced in a byelection.
Dates for byelections
In England, all current vacancies which do not fill a term ending in 2021 will be held on 6 May 2021, the ordinary day for local elections. The Cabinet Office has confirmed that local elections teams should not plan on this date being brought forward. Regulations in Wales will require outstanding byelections to be held in a period between 1 March and 16 April 2021.
Denbighshire: The byelection due in Corwen division will be held on 18 March.
Isle of Anglesey: The byelection due in Caergybi division will be held on 6 May.