CASTAWAY (1986, UK, 117m, 15) *** Adventure, Drama dist. Columbia-Cannon-Warner (UK), Cannon Film Distributors (USA); pr co. Cannon Screen Entertainment / United British Artists (UBA) / Castaway Films; d. Nicolas Roeg; w. Allan Scott (based on the book by Lucy Irvine); pr. Rick McCallum; ph. Harvey Harrison (Colour | 1.85:1); m. Stanley Myers; ed. Tony…