They are the principal authorities in Greater London and have responsibilities including education, housing, planning, highways, social services, libraries, recreation, waste, environmental health and revenue collection.

Some of the powers are shared with the Greater London Authority, which also manages passenger transport, police and fire.

One of the Conservative councillors for the Kelsey and Eden Park ward resigned in October 2018 because he had to move due to work relocation.

[2] One of the Labour councillors for Crystal Palace ward, Marina Ahmad, resigned in 2021 to seek election as a member of the London Assembly for the Lambeth and Southwark constituency.

[5] Along with most other London boroughs, Bromley was subject to a boundary review ahead of the 2022 election.

All registered electors (British, Irish, Commonwealth and European Union citizens) living in London aged 18 or over were entitled to vote in the election.

[15] The Shortlands and Park Langley by-election was triggered by the resignation of Conservative councillor Aisha Cuthbert.