Access Status of ES 12/644

Request

I would like to make a request under the relevant legislation for the following information regarding ES 12/644:

1. The date this document was first made public at TNA
2. The date it was removed from public view at TNA
3. The reason for its removal
4. Its publication

With regards to question 4, you provided clarification on 12th June 2025 confirming you were asking that the record be made open and available for public viewing at The National Archives. We are therefore handling this question as a separate closed document request which we have given the reference number CAS-265492-D8N9B0.

Outcome

Information provided.

Response

1. The date this document was first made public at TNA

15th October 2015

2. The date it was removed from public view at TNA

29th January 2019

3. The reason for its removal

All AB and ES records were removed from public access on the request of the parent government departments for the purpose of review. Further information relating to the ongoing review of these records related to the United Kingdom’s Nuclear Weapons programme can be found here: Review of nuclear archive records – GOV.UK

4. Its publication

This is being handled as a separate Freedom of Information request: CAS-265492-D8N9B0.