For those who don't recognize him, Dominic Claydon is played by Matthew Lewis, who also played Neville Longbottom in the Harry Potter films.
Kris Marshall (DI Humphrey Goodman) & Sylvestra Le Touzel (Joanna) also worked together on episode 4.7 Blind Justice (2003) of Murder City (2004) as Nick Harper & Sandra Kendrick respectively.
Kris Marshall (DI Humphrey Goodman) & Jason Merrells (Stuart Howe) also worked together on episode 2.1 Wives and Lovers (2006) of Murder City (2004) as DS Luke Stone & Mark Drummond respectively.
Both Jason Merrells an Sylvestra Le Touzel were guest stars on shows that starred Kris Marshall. Jason Merrells guest starred in Wives and Lovers (2006) episode of Murder City (2004), and Sylvestra Le Touzel - in Blind Justice (2003) episode of My Family (2000).