Simon Pace

Charlie & Liam's dad was portrayed by Robin Atkin Downes

in Charlie's dream sequence in "Fire + Water". 

I honestly can't believe this:

 is the same guy as this:

John Henry Canavan portrayed Simon Pace 

in the Season 3 episode "Greatest Hits".

I have written to both Mr. Downes and Mr. Canavan, requesting autographs.

I'll update this post if/when I receive responses.