Nope, definitely David Tennant - I hadn't seen him in anything prior to Doctor Who, so was very surprised when later hearing him with a broad Scottish accent in

Nope, definitely David Tennant - I hadn't seen him in anything prior to Doctor Who, so was very surprised when later hearing him with a broad Scottish accent in an interview. I've heard him discuss the preference (it's more unsettling / convincing) for middle-class English accents when playing a conventional bad guy role.