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In page Sellafield:

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As of 2014, the First Generation Magnox Storage Pond (FGMSP) remains as a priority decommissioning project. As well as nuclear waste, the pond holds about 1,200 cubic metres of radioactive sludge of unknown characteristics and 14,000 cubic metres of contaminated water.[4] Decommissioning initially requires retrieval of the radioactive sludge into a newly built Sludge Packaging Plant 1, as well as fuel and skip retrieval. Completion of this will allow the dewatering and dismantling of the remaining structure. Future work will immobilise the sludge for long-term storage, and process solids through the Fuel Handling Plant for treatment and storage.[5]