At least, he’s got good hair!
From one of the bts movieset vids,
where there’s also an interview with Paul Gross - who confirms they had great fun together (~at 01:43 - "people think we're fools, and we probably are, but, no we had a great time!")
and one with William Phillips who also mentions Callum, at ~02:45 - "He came in, you know, ready to have fun. That was probably the biggest thing for him, he really enjoyed himself and that came out in the character. And the character of Ben Cutler is a bit of a crazy angry maniac, but there is this glint of fun in his eye the whole time which made the character really shine, and I'm so happy that Callum came aboard."