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She appeared in Stephen Poliakoff's BBC TV drama, The Tribe, with, among others, Anna Friel and Joely Richardson (a production largely overshadowed by press interest in Friel's full-frontal nudity).
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In 1998 she played alongside Alan Davies in "Black Canary", an episode of the BBC TV mystery series, Jonathan Creek, and as Davies' wife in a pilot episode of the BBC comedy, A Many Splintered Thing (of which a series was made in 2000, by which time Isitt had joined the cast of Coupling)
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Isitt had a minor part in the film of The Saint (1997), which starred Val Kilmer (as Simon Templar) and Elisabeth Shue.
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It was in an episode of the second series of Is It Legal? that Isitt had her first and brief televisual encounter with Ben Miles, to whose character, Patrick Maitland, Sally became closley attached in Coupling. Sally's interest in Patrick has been cited as that of a "size queen".