Chris Walker-Thomson is an actor and voice actor in the U.K. His most notable impression being the 2nd doctor, Patrick Troughton. He has done audiobooks and an audio drama for Big Finish. He talked to me about Doctor Who, voices, and what he wants to be as an actor. He's also been featured on BBC's Youtube Doctor Who fan show.  Catch his podcast of voice impressions with his pals, We Sound Familiar