Alan Williams has portrayed several characters in Casualty and Holby City. In Casualty, he played Ronnie Rosco in "Evolve or Be Extinct", Colin Firth in "Clinging On", Roy Hills in "Strike Three", Les Grahams in episode 1119, and Roy Scaddon in episode 1186. In Holby City, Williams portrayed Robert Mallory in "Bitter from the Sweet", and Ralph Lawrence in "Revelations".
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