He was born in London on July 1947 (the 2nd, 3rd or even the 23rd of July, depending on the source). He began his career in 1972 by acting at the Northcott Theatre (Exeter) in William Shakespeare's Measure for Measure.
He appeared in Andrew Lloyd Webber's flop musical Jeeves in London, 1975, and sang on the rare recording. He would have to wait until 1975 to debut on the screen. He did one guest appearance as a waiter on TV series Softly Softly, plus a small appearance in Stephen Frears' TV movie Three Men in a Boat, starring Tim Curry. He also reached the silver screen with Richard Loncraine's Flame.
However, for the rest of the 1970s, Dicks' appearances were scarce. He, however, acted in radio series Patriots Three.
In 1980, however, Dicks acted in two important places. Firstly, he acted in the Lyric Theatre, Hammersmith, in Martin Duncan's Amusing Spectacle of Cinderella and Her Naughty-Naughty Sisters: A Family Pantomime. His role was that of Pearl, the main and mean naughty-naughty sister.
He also had a cameo in Star Wars: Episode V The Empire Strikes Back as an Imperial officer, commanding the Star Destroyer Tyrant. The movie credits him only as "Imperial Officer," but the Expanded Universe later named him Captain Lennox.
During the early 1980s, Dicks continued a discrete career on mini-series (Giuliano Montaldo's Marco Polo, 1982) or TV movies (Jim Goddard's Hitler's S.S.: Portrait in Evil, 1985), only occasionally reaching mainstream movies (Frank Cvitanovich's The First Kangaroos, where he played a priest).
He also acted in theatre, particularly at the Royal Shakespearean Theatre and The Barbican Theatre, acting in The Comedy of Errors in 1983 and 1984, respectively.
In 1989, he had his first chance to direct at theatre, in the Griffin Theatre Company, Sydney, with the play Sons of Cain.
In 1991, he returned to cinema playing a new priest on John Duigan's Flirting, featuring a young Nicole Kidman, and also with long-awaited sequel Return to the Blue Lagoon. He appeared that same year on a mini-series, The Gravy Train Goes East.
For the remaining 1990s, Dicks could only appear in guest appearances in TV series like Time Trax, Snowy River or Law of the Land, where he played a recurrent character in the second season. He was also one of the main cast members of series Mercury, starring Geoffrey Rush.
Dicks returned to cinema only once more, for Anne Rice's adaptation Queen of the Damned (2002), acting as one of the Talamascans.
Since then, Dicks has moved to Israel, where he acted in 2004 in the Haifa English Theatre (Haifa) in two different plays (Cemetery Club and A Party to Murder), and directed two other plays (Do Not Go Gentle and Farndale Townwomen's Guild Dramatic Society Murder Mystery).