I love it when this happens.
so I was just re-watching the Doctor Who episode The Empty Child, and it got to the scene in the hospital where Dr. Constantine is explaining the mysterious illness when I was suddenly like, I KNOW THAT VOICE.
one IMDB search later and my suspicions were confirmed; the actor Richard Wilson is well known for his role as Gaius on the show Merlin.
also he was in this Mr. Bean sketch I watched as a child. whaaaaaaat.