McCallum initially worked as an actor in minor roles – most memorably as Detective Chief Superintendent David Graves in the BBC drama Between The Lines and as D.I.
He played Piers in the Tales of the Unexpected (TV series) episode (9/6) "Wink Three Times" (1988).
He made his television debut as Lord Alfred Douglas in the ITV series Oscar (1985).
As a result, he became a national ITV Weather presenter, until he joined the ITV London regional weather team alongside fellow forecasters Manali Lukha and Chrissie Reidy in 2005.
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