https://discovery.nationalarchives.gov.uk/details/r/C11446022
Board of Inquiry: accident to Lightning XS 894; 5 Squadron, RAF Binbrook, on 8 September...
NOT DIGITISED - view at Kew or pay for copy.
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Catalogue description Alleged UFO incident: crash of Lightning F6, 8 September 1970
Access conditions: Closed For 90 years
Record opening date: 01 January 2085
https://discovery.nationalarchives.g...880566&catln=6
(sorry for the weird text sizes, copy/paste from elsewhere - pprune does not seem to have a way to fix it.)