Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what the current volume is of the civil plutonium stockpile in tonnes.

As of 31 December 2023, the total holding of separated civil plutonium in the UK was 140.9 tonnes.

The Office for Nuclear Regulation publishes annual figures on the UK's separated plutonium inventory. The most recently published data can be found at the following link: 2023 annual figures for holdings of civil unirradiated plutonium | Office for Nuclear Regulation