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Allen Leech has joked about how the pair look similar.
Downton Abbey star Allen Leech believes Mullingar's Niall Horan could play him if there was a spin-off series, which focuses on his character Tom Branson's younger self.
The actor, who was married Lady Sybil in the series, told Movies.ie, that a lot of people comment that they look alike.
Downton Abbey - A New Era is out in cinemas now.