Just watched my first G&S in full
The Yeomen of the Guard. The English National Opera did a production of this last year:
https://www.eno.org/operas/the-yeomen-of-the-guard/
They transposed the setting from the 16th century to c.1955 and changed Fairfax's crime to espionage.
Quite enjoyed it and they're doing Iolanthe in October.