Calvine UAP — UK Parliamentary Questions and MoD Release
The UK Ministry of Defence held the Calvine photographs SECRET for 32 years. Parliamentary questions in 2021 about the photographs prompted formal government responses. Journalist David Clarke obtained a copy from a former MoD official and published it, which triggered the official National Archives release in 2022. The released DI55 Defence Intelligence Staff assessment showed the MoD concluded the craft was of 'unknown origin' and not any allied nation's program.