McIntosh’s major breakthrough came in 1999 when he became a member of the successful pop group S Club. The group had 11 top 5 UK singles, of which four were number ones, and they released four albums, which were all awarded Platinum status in the UK. Their biggest hits were Have You Ever, Don’t Stop Movin’ and Never Had a Dream Come True. The group starred in their own television series, which went on to become very popular. After their debut big- screen adventure film, Seeing Double, the group disbanded in 2003 and went their separate ways after releasing a greatest hits album and single.

In 2006 McIntosh starred in an MTV’s show, called Totally Boyband. Other people starring were members of disbanded groups. He became part of a boyband, Upper Street made up of ex-group members. The groups that each member was from were 911, Steps, Another Level and New Kids on the Block. They released their first (and only) single, “The One”, in 2006, but it was a commercial disaster and charted at #35 in the UK Singles Chart.

From November 2008, McIntosh and his former bandmates, Jo O’Meara and Paul Cattermole, signed up to be part of an S Club reunion. McIntosh has released some solo tracks on Youtube, such as “Wonder Girl”, “Always and Forever”, “Sup Baby”, “Ready or Not”, “I Don’t Wanna Be Ya Man”, “Sound Good” and “My Everything”. In 2008, he collaborated with Robbie Glover on a track called “Hands Up”.