Wikipedia.org has said Lucy Griffiths(Lady Marian) stated in an interview with FHM Magazine in December 2007 that she "has already signed up for a third season of Sherwood Forest fun".
Here is the link:
The information is on the last paragraph at the top of the page.
I'm sure lot's of Robin Hood fans will be delighted to know Marian is returning. I know i am. :)
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