He began a West End theatre acting, dancing and singing career in 1987 at age 22 at the Prince of Wales Theatre playing "Benjamin" in a stage and road production of Seven Brides for Seven Brothers, directed by Michael Winter, and in 1990 playing "Lt. Buzz Adams" in South Pacific, directed by Roger Redfarm.
[2] Grainger has participated in over 60 British television series and films in his career, among them The Bill, Rosemary and Thyme, Heartbeat, Bad Girls and EastEnders.
In New Zealand he has appeared in local programmes Shortland Street, Outrageous Fortune, The Million Dollar Con Man, Life's A Riot and The Cult.
He has received recognition for a variety of worldwide television commercial appearances,[1][2] as well as a role in the first season of Ash vs Evil Dead in 2015.
Among the feature films he has appeared in are Parting Shots (1999), In the Beginning (2000), Large (2001), Spy Game (2001), Mean Machine (2001), Kiss Me Deadly (2008) and The Lovely Bones (2009).