The UK Atomic Energy Authority (UKAEA) has published its first strategy since establishing subsidiary UK Fusion Energy Ltd in 2024, with remaining fusion research activities now constituting UKAEA's National Fusion Laboratory. The strategy sets out how UKAEA will deliver foundational research, technology and innovation to support the UK fusion sector, while UK Fusion Energy Ltd leads the design and delivery of prototype and future fusion power plants, in line with the UK government’s objective to expand the sector and capture economic and strategic benefits. It responds to increasing global demand for low-carbon, secure energy and rising international investment in fusion, while recognising significant technical and commercial challenges that require sustained public funding and collaboration. The approach focuses on addressing core fusion challenges, advancing research across the full lifecycle, and organising activity around international collaboration, research, commercialisation and industry development to strengthen UK capability and supply chains. Delivery is supported by substantial government investment in infrastructure, facilities, advanced computing and workforce development, alongside regional cluster growth. By 2030, UKAEA aims to support the design of a prototype fusion power plant, advance scientific knowledge, reduce technological risk and expand UK industrial capability, while acknowledging that fusion energy is unlikely to be deployed at scale before 2050.