If you loved Operation Mincemeat, try Mrs Brown
A bridge between a film you've already seen and one most people haven't. Mrs Brown has roughly 4.2× fewer votes than Operation Mincemeat — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by John Madden, and they both carry the bittersweet mood tag, and they sit in Drama / History territory. If that's the register that drew you to Operation Mincemeat, the second film will land in a comparable space — through a different lens.
What Mrs Brown is
Here we have a rather proper Victorian tearjerker. The recently widowed Queen Victoria finds unexpected comfort in the company of a Scottish servant. Their bond raises eyebrows, and hackles, in the royal court. Well, it got Judi Dench an Oscar nomination.

