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He also played a small role in the film Highlander. He played the part of Dougal MacLeod, cousin of Connor McLeod.
Under the name GBH, Hartman was the host of the rock 'n' roll revival television show Oh Boy in 1979.
Hartman appeared as Dave Slade in the 1994 Heartbeat episode "Wild Thing"; he played Dave Slade, whose dog was attacking sheep.
On 26 October 2013, Hartman played the role of Graham O'Reilly on Casualty.
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