If Network's DVD release of Callan - The Monochrome Years whetted your appetite for more – and it certainly should have – then the follow-up you've been waiting for is almost upon us, as Network have announced Callan - The Colour Years for a UK DVD release in May.

Edward Woodward gives an electrifying performance as a reluctant professional killer working for British Intelligence. Callan became a national phenomenon in the late 1960s, making Woodward one of the highest profile actors on television and paving the way to his eventual career in America on shows like The Equalizer.

Created by James Mitchell (When the Boat Comes In) and exploring the dingy, twilight world of the professional spy, Callan was the antithesis of the James Bond films (back in the days of Connery and Moore) and presented what was, until that point, television's most realistic portrayal of government espionage.

Callan - The Colour Years will be released on UK DVD by Network Releasing on 10th May 2010 at the RRP of £79.99. The six-disc set will contain all twenty-two colour episodes from the Thames Television-produced series three and four – the majority of which have been unseen for over twenty years and are available here for the first time. No extra features have been detailed as yet.

You can read our review of Callan - The Monochrome Years here.