Yes, Burn Gorman! (Who seems to be in every other British film/TV show I watch.)
But there's an even closer association with DS because Doug Jones, the actor who embodied the "creature" makeup for Edith's Mother / Lady Sharpe, also appeared in the '04 DS pilot as two different characters:
The Train Demon:
here are two production photos from the pilot:
Creature actor Doug Jones as the Train Dream Demon.
Vicki, director PJ Hogan, and the Demon.
And the desiccated Barnabas:
I have some production stills to share to help to better illustrate what's just happened. First off, a lovely photo of creature actor Doug Jones as Barnabas in full desiccated makeup (complete with red eyes and pointy nails):
...
And for a bit of fun, here's a shot of Doug Jones getting the finishing touches of his body makeup applied:
