He starred opposite Samantha Bond in the 1989 television serial The Ginger Tree (based on the novel by Oswald Wynd), playing Count Kentaro Kurihama.
Once they arrive at the factory, they are led to a security scanner, which surreptitiously collects their DNA to transfer to an "Archetype" (Thomas Knight) under the supervision of the factory's owner, Mrs Wormwood (Samantha Bond).
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Eastside Educational Trust's celebrity patrons include but are not limited to: Denys Baptiste, Quentin Blake, Samantha Bond, Patti Boulaye, Katie Derham, Jenny Eclair, Frederick Forsyth, Henry Goodman, Richard E Grant, David Harewood, Anish Kapoor, Martha Kearney, Soweto Kinch, Mark Lawson, Adrian Lester, Sharman Macdonald, Curtis Walker, Zoë Wanamaker, Sir Arnold Wesker, Samuel West and Gary Wilmot.
McCallum played the missionary Alicia Bassett-Hill in the 1989 TV serial The Ginger Tree, which was based on the novel by Oswald Wynd; it also starred Samantha Bond and Daisuke Ryu.
In 2008 he co-wrote A Bunch of Amateurs - starring Burt Reynolds, Sir Derek Jacobi and Samantha Bond - which was the Royal Film Performance for that year.
In 2005, on ITV, Gemmill starred in Distant Shores, as Duncan, alongside Samantha Bond and Peter Davison, while in 2007, Gemmill he appeared as Dr David York in the Channel 4 drama Cape Wrath.