Downton Abbey star Allen Leech has a winning way with accents.

The Irish-born actor employs his native brogue in portraying Tom Branson, the former chauffeur who's become a landed-family insider on the PBS series that returns Sunday for its fifth season. But moviegoers hear a Scotch lilt from Leech's World War II code breaker in The Imitation Game.

And, for an audience of one, Leech seals his adroitness with an impish take on the posh English tones of Downton Abbey creator and writer Julian Fellowes.