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.

[4] The Conservative councillor Robert Davis, who represented Lancaster Gate and had served on the council since 1982, resigned after an investigation into his conduct found that he broke the councillors' code of conduct for receiving a large number of gifts and hospitality from property developers.

[5] The 22 November 2018 by-election was held for the Conservatives by Margot Bright with the Labour candidate coming in second place.

[6] In March 2021, Andrea Mann, a Labour councillor for Churchill ward, resigned for family reasons.

The concentration of Labour voters in a small number of wards means that relatively few seats in the borough are marginal.

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