He is best known for his TV work, appearing in former
Channel 5 soap opera Family Affairs,
Where the Heart Is,
BBC Three's
Grass and
Kay Mellor's drama series
Strictly Confidential. He also played
DC Mitch Cowen in
EastEnders in 2005. Another minor role was as an actor in a crime reconstruction in
Lynda La Plante's
Trial & Retribution. In January 2000, Gemmill appeared in
Coronation Street as a therapist for
Leanne Tilsley and in 2001, he appeared in six episodes of
The Bill as corrupt Detective Sergeant Peter Cork, in a storyline following a serial rapist. These episodes saw his character sexually assault DC Kate Spears, romance PC Cass Rickman, and be exposed as colluding with another corrupt officer in sheltering the rapist (played by
Michael McKell), only to be killed after being stabbed by the same rapist. He also starred in the final series of ''
London's Burning'' as firefighter Frank Mooney in 2002. In 2005, on ITV, Gemmill starred in
Distant Shores, as Duncan, alongside
Samantha Bond and
Peter Davison, and also appeared as Major Despard in "
Cards on the Table" part of the 10th season of ''
Agatha Christie's Poirot. In 2007, Gemmill appeared as Dr David York in the Channel 4 drama Cape Wrath''. Gemmill played consultant
Adam Trueman in the long-running
BBC medical drama
Casualty from September 2007 to August 2011. In a "celebrity" edition of
Mastermind, aired on BBC 1 on 1 January 2010, Gemmill defeated comedians
John Bishop and
Ed Byrne and TV presenter
Anneka Rice to win the trophy. His specialist subject was the
Apollo Moon Landings. In May and June 2012, he filmed a fantasy adventure movie then titled
Mariah Mundi and the Midas Box throughout the South West of England, playing the role of Isambard Black. The film was released in 2014 as
The Adventurer: The Curse of the Midas Box, and garnered mostly negative reviews. From 2015 to 2019, he portrayed
Tracy Barlow's former husband
Robert Preston in
Coronation Street, taking over from the original actor,
Julian Kay. The character was killed off on Christmas Day 2019. == Personal life ==