Local government reorganisation transition in practice: shadow authorities and section 16 agreements explained

For councils navigating local government reorganisation (LGR) for the first time, the legal framework of the transition period can appear complex and resource-intensive. 

It involves new statutory bodies, inter-authority negotiations, competing timelines and legislation that has not been applied at this scale in recent years. The shadow authority and the section 16 agreement are the two central instruments in this framework, both requiring close attention from monitoring officers, Section 151 officers and legal teams.

A clear understanding of their purpose, and the practical challenges they present, is essential for any council entering the process.

The shadow authority: role and practical significance

A shadow authority is the governance structure for a new unitary authority established in advance of its formal legal existence. It is typically constituted around 12 months prior to vesting day and enables the incoming authority to undertake the preparatory work required to operate effectively from day one. This includes adopting a constitution, establishing committees, appointing senior officers and initiating the integration of services and systems.

The shadow period is a substantive governance phase, not a procedural formality. Key decisions are taken on governance structures, senior appointments, service delivery models and financial frameworks. These decisions will have lasting implications for the incoming authority’s effectiveness, culture and financial resilience. Predecessor councils and their officers play an important role in supporting this work, while continuing to discharge their existing functions.

A recurring challenge during this period is managing the interface between outgoing councils and the shadow authority, particularly where there is differing political control. Both have legitimate interests in transition decisions. Clarity on decision-making boundaries, including the application of section 24 spending controls (that we have addressed separately), is essential to avoid conflict and delay.

The Section 16 agreement: purpose and scope

The section 16 agreement derives from section 16 of the Local Government and Public Involvement in Health Act 2007. It provides the statutory basis for agreements between predecessor and successor authorities concerning the transfer of functions, property, rights and liabilities. In practice, it is the primary legal mechanism through which the transition is structured and implemented.

If no agreement is reached, or where it is incomplete, the default position under the Transfer of Functions, Property, Rights and Liabilities Regulations 2008 applies. This default framework is generic and may not reflect local priorities or operational realities. For that reason, negotiating a comprehensive and precise section 16 agreement is a critical legal workstream in any local government reorganisation programme.

A section 16 agreement will typically address a broad range of matters, including:

• Allocation of land, property and other assets (particularly where multiple successor authorities are created) 
• Transfer, novation or assignment of contracts 
• Treatment of council companies and other corporate vehicles 
• Allocation of pension liabilities 
• Financial arrangements for the transition period, including shared or interim service delivery 

Early scoping of these issues is essential to avoid delay and dispute at later stages.

The working constitution: a critical deliverable

Among the workstreams associated with establishing a shadow authority, the preparation of the working constitution is one of the most complex and time-critical. It defines the governance framework under which the new authority will operate from vesting day.

This requires decisions on executive arrangements (cabinet or committee system), overview and scrutiny structures, delegation frameworks and the procedural rules governing decision-making. All of these must be in place before vesting day.

This work requires careful development and cannot be compressed without risk. The constitution underpins democratic accountability and operational effectiveness. Deficiencies at this stage, whether legal, structural or practical, can be difficult and time-consuming to rectify once the incoming authority is operational.

Key legal risks to manage

Several areas of legal risk arise consistently during transition and require early, proactive management:

• Data protection and information governance - The transfer of data engages obligations under the UK GDPR and the Data Protection Act 2018. Data sharing agreements, impact assessments and lawful processing bases must be established in advance of vesting day. Delay in this area can present disproportionate legal and operational risk. 
• Contract management - Existing contracts must be systematically identified, categorised and reviewed. While some will transfer automatically, others will require novation or assignment, potentially involving third-party consent. Contracts spanning vesting day, particularly high-value or critical service contracts, require early analysis to ensure smooth continuity of service. 
• Financial alignment - Differences in financial positions, reserves, accounting policies and medium-term plans must be addressed and reconciled. These issues should be clearly reflected and resolved through the section 16 agreement process. 

Sequencing and programme management

Previous local government reorganisation programmes demonstrates that transition periods are typically shorter and more demanding than anticipated. The scale of legal and governance work is frequently underestimated.

Councils that begin early mapping of assets, liabilities and contractual positions, ideally following confirmation of the structural change order, are significantly better prepared. Delay in this exercise compresses already limited timelines and increases delivery risk.

Outgoing councils should consider establishing a dedicated transition programme structure, with clear workstream ownership, defined milestones and regular reporting to members and senior officers. Section 16 negotiations in particular benefit from structured governance, early issue identification and clear escalation routes for decision-making.