Statutory instruments for the creation of the new authority were made on behalf of the
Secretary of State for Housing, Communities and Local Government on 25 May 2018, and a shadow authority was formed the following day. The shadow authority was composed of the existing borough councillors from Bournemouth, Christchurch and Poole, as well as the county councillors representing Christchurch. The shadow authority had 125 members, and first met on 6 June 2018. However, later that year a review by the
Local Government Boundary Commission reduced the number of wards for the new authority to 33 multi-member wards, with 76 councillors in total. The first elections took place in 2019 alongside other local elections, and led to the Conservatives holding the most seats but lacking a majority, meaning that the council was under
no overall control. Subsequent to the election, the
Liberal Democrats, the second largest party in the council, led the creation of the Unity Alliance Administration, made up of the Liberal Democrats (15),
independents (11),
Poole People (7),
Labour (3),
Green Party (2) and Alliance for Local Living (1). The Unity Alliance therefore had 39 members, the number required for a majority. The remaining councillors, belonging to the Conservative Party (36) and
UKIP (1), remained in opposition. However, two Unity Alliance councillors died in 2020, and two Poole People councillors left both their party and the administration, leaving the administration in minority; a vote of no confidence in council leader
Vikki Slade was subsequently passed, removing her as leader. A new leader was elected on 1 October 2020. == Geography ==