Background On 12 March 2026, the UK government confirmed that important changes will be made to the National Security and Investment Act (NSIA) Notifiable Acquisition Regulations (NARs) and the scope of the NSIA mandatory notification regime. The changes follow the consultation that closed in October 2025 (see related Akin Alert here) and represent the first major developments since the NSIA came into force in January 2022. The UK government continues to refine the NSIA on an iterative basis, incorporating feedback from businesses and stakeholders (for example, narrowing the scope of the Artificial Intelligence schedule) while balancing the constantly evolving risks to national security (including confirmation that the water sector will be included within the NSIA mandatory notification regime).