In 2006, Gallagher signed up to Coronation Street to play the part of Paul Connor, one of two brothers buying a share in Underworld, the local knicker factory.
In early 2007, Gallagher resigned from the Manchester-based ITV programme to pursue other roles, eventually leaving Coronation Street in June 2007.
[1][2] On 2 July 2007, it was announced Gallagher had been cast for the lead role of Mal Faith in a new ITV drama series, Rock Rivals, produced by Shed Productions.
In 2017, he appeared in Midsomer Murders "Red in Tooth & Claw" as Errol Judd and in 2019 in Father Brown “The Sacrifice of Tantalus” as Len Blaisen.
In August 2008, Gallagher appeared as a celebrity contestant on an episode of Who Wants to Be a Millionaire, raising funds for World Animal Protection project to end bear dancing in India, "an issue that he feels strongly about.