[en] The UK's nuclear legacy is a major public liability, and arguably represents the largest, most important environmental restoration programme in Europe. The Nuclear Decommissioning Authority (NDA) is a public body and is the strategic authority that owns 19 legacy civil nuclear sites and the associated nuclear liabilities across the UK. We have an annual budget of ~£2.8bn ($4.513bn CAD) and manage a total discounted liability of £49.152bn ($79.231bn CAD). Our core objective is to ensure that these historic nuclear legacy sites are decommissioned safely, securely, cost effectively and in ways which protect the environment. The sites range in size and complexity of decommissioning from commercial generating stations and experimental reactor sites through to Sellafield, one of the most complex nuclear sites in the world. In order to bring a clear focus to our mission we have identified six strategic themes under which we group all of our activities which are: Site Restoration, Spent Fuels Nuclear Materials, Integrated Waste Management, Business Optimisation, Critical Enablers. There are numerous examples of successful strategy implementation across the NDA estate. The Active Handling Building at Winfrith has now been fully decommissioned and that area cleared. An experimental reactor has also been fully decommissioned and the site is at present being cleared. Challenges that remain include work at Dounreay and the progress being made taking apart the legacy after four decades of research, stretching back to the earliest days in the industry. The experimental nature of many of its redundant facilities means the clean-up and demolition requires particular innovation. The Legacy Ponds and Silos (LP&S) programme at Sellafield poses the most significant challenge within the UK's nuclear legacy, and where it is essential that tangible, demonstrable progress is made. The LP&S programme scope comprises of the retrieval of waste from the four main plants on site which were used historically to prepare fuel for reprocessing or storage. Nuclear site operations and successful site restoration depend on the availability of suitable waste management routes and facilities. Effective management of both radioactive and non radioactive waste is essential to the delivery of our mission and is a significant part of our programme. The UK's approach to Waste Management will be discussed and the information on the evolution of the waste management and the importance of building on lessons learned will be shared. This includes the Geological Disposal Facility (GDF) and the importance international communication has on the development of a waste disposal facility.