He also depped on various daytime shows for the next two years, then joined the commercial radio station Clyde 1 in October 1998 to present the weekend "Scottish Night Network" shows (concurrently airing across Scotland's local commercial radio stations Clyde 1, Forth 1, Northsound 1, Tay FM, Westsound, West FM and Westsound FM) then progressed to Clyde 1's Weekend Breakfast Show briefly in November 1999.
Whilst there Stewart worked for Grampian TV in Aberdeen on weekdays since joining the station in April 1998, by producing and presenting political reports on the BAFTA award-winning news programme North Tonight for the ITV station covering the North of Scotland.
In November 2005, Stewart compiled and presented daytime news bulletins on a freelance basis at the national rock and pop station Virgin Radio, then was part of the on-air launch team at the UK's first commercial talk radio station outside London, presenting his own daily phone-in show "Graham Stewart's Afternoon Edition" on Talk 107 from January 2006 – March 2007.
During the Scottish referendum campaign later that year he presented the daily 'Referendum Tonight' programme on BBC Radio Scotland in August and September 2014.
As a writer he wrote books and articles mainly on technology and media for publications, including Scotland on Sunday and Macworld.