Department for Energy Security and Net Zero written question – answered at on 17 November 2025.
Helen Maguire
Liberal Democrat Spokesperson (Primary Care and Cancer)
To ask the Secretary of State for Energy Security and Net Zero, what quantity of plutonium was added to the civil plutonium stockpile in the last year.
Michael Shanks
Minister of State (Department for Energy Security and Net Zero), Minister of State (Department for Business and Trade)
The UK is no longer adding to the inventory of separated civil plutonium through reprocessing spent fuel. The Thermal Oxide Reprocessing Plant (THORP) at Sellafield is now closed, having ceased reprocessing operations in November 2018 and the Magnox reprocessing facility ceased reprocessing operations in 2022.
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Secretary of State was originally the title given to the two officials who conducted the Royal Correspondence under Elizabeth I. Now it is the title held by some of the more important Government Ministers, for example the Secretary of State for Foreign Affairs.
