See Photos of the "Downton Abbey" Cast Then and Now

Leech's higher profile thanks to "Downton" has landed him supporting roles in a handful of major movies. Most notably, he played spy John Cairncross in "The Imitation Game" opposite Benedict Cumberbatch and Keira Knightley, and he appeared in "Bohemian Rhapsody" as Paul Prenter, Freddie Mercury's manager and boyfriend.