TV
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The former soap actor, who played Dennis Rickman, will appear as charismatic businessman Sam Franklin in the BBC One drama.
Harman takes over from Max Beesley on the show, which begins shooting later this year. Series four will air in 2009.
A BBC spokesperson said: "The new series promises to be packed with big stories and a dream list of guests.
"The introduction of Nigel Harman as Sam... will most definitely stir things up."
More: Nigel Harman, TV
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