He has appeared on television in "Love and War in the Appenines," "Shades," "The Bill," "The Practice" and "Casualty," and played the role of 'Aramis' in the Mario Andreacchio feature film "Young Blades."
Callum: I watched Prince William for ideas because I think he's the most charming out of the lot of them. I think he's the most likable, as well. Again, I think it's so easy to play these characters without redeeming qualities. They've had everything their whole lives. And I really wanted him to be a likable character so I practiced the wave and the walk and I tried to get a bit of that in him. So yeah, I watched this video called "How to be a Prince." I have no idea how I found it.( Talking about his charcter in princess diaries 2)
(asked "What do you do when you're not working?")Callum: I've been out of drama school for three and half years and I've worked constantly. I think I had three months off once and I panicked. I was like, "Oh my God, I'm never, ever going to work again," so I just drank a lot of beer – and it really helped.
(talking about TV vs. movies)Callum: Three years, I'm not over the hill (laughing). For me, at this stage in my career, I like TV better because I got to live with my character in "Dead Like Me" for two seasons. I come into a movie and it's harder because I got the character in the last week of shooting, and that's no good to me. I think when you're an experienced film actor, you can come in and turn it on straight away. But for me, it takes a little bit of time. For me at the moment, TV is rewarding me more because I really get the character.