The film stars Colin Firth, Kelly Macdonald, Matthew Macfadyen, Penelope Wilton, Johnny Flynn and Jason Isaacs.

Operation Mincemeat had its world premiere at the 2021 British Film Festival in Australia, and was released in the United Kingdom on 15 April 2022 by Warner Bros. Pictures.

Lieutenant Commander Ewen Montagu, a Jewish barrister, remains in England while his wife Iris and their children travel to safety in the United States.

The team fabricate items for Martin to carry in his pockets, including theatre tickets, personal bills and a love letter from "Pam" written by Hester.

Specialist MI5 driver St John "Jock" Horsfall transports Montagu, Cholmondeley and the corpse to the submarine base at Holy Loch.

Captain David Ainsworth, the British naval attaché in Madrid, meets with Colonel Cerruti of the Spanish secret police in one last attempt to get the papers to the Germans.

In addition, other notable historical figures are briefly included in the film, with Alexander Beyer as Karl Kuhlenthal, Nico Birnbaum as Colonel Alexis von Roenne and Pep Tosar as Admiral Moreno.

[4] In December, Matthew Macfadyen, Penelope Wilton, Johnny Flynn, Tom Wilkinson, Hattie Morahan, Simon Russell Beale, Paul Ritter and Mark Gatiss were added to the cast.

[8] Although the main thrust of the film is historically accurate, the filmmakers made some omissions and additions that were not in MacIntyre's book, including the creation of a fictional sub-plot involving a love triangle between Montagu, Cholmondeley and Leslie.

[9] In February 2021, Warner Bros. International acquired the distribution rights to the film in the UK, Republic of Ireland, France, Germany, Spain, Italy and Benelux.

The website's critical consensus reads, "If its fact-based story proves more fascinatingly outlandish than it's presented here, Operation Mincemeat remains an engaging and well-acted wartime drama.

[15] Christy Lemire, writing for RogerEbert.com, assigned the film a 3 out of 4 stars, stating that "The story itself is so absurd and is told with enough surprises and dry humor that it’s constantly engaging.

"[16] Stefan Pape of Common Sense Media, giving it 4 out of 5 stars, praises director John Madden and says "This drama — based on real events — is such a brilliantly cinematic story, it almost feels as if it would have been impossible to get wrong.