I remember a book about this, probably 20 years ago... anyway, the title I remember turned up a 1956 movie about it. :^)
https://www.thehistorypress.co.uk/articles/operation-mincemeat-the-man-who-never-was/
https://www.cwgc.org/our-work/blog/the-man-who-never-was-the-true-story-of-operation-mincemeat/
https://www.imdb.com/title/tt0049471/
https://www.rottentomatoes.com/m/man_who_never_was
https://www.amazon.com/Man-Who-Never-Was/dp/B0007ZEOQE
https://www.amazon.com/s?k=The+Man+Who+Never+Was&i=stripbooks
Thanks! I’ve got both movies in my Netflix queue. Looks like ‘Operation Mincemeat’ hasn’t been released for home DVD, yet.
That’s all I use; can’t get decent streaming out here in the sticks.