The Life and Loves of a She-Devil
The novel was made into two movies.  In 1986 it was as an award-winning BBC television serial.  It starred Patricia Hodge as Mary Fisher, Dennis Waterman as Bobbo and Julie T. Wallace as Ruth.  In 1989 it was made as She-Devil.  This version starred Roseanne Barr as the "she-devil" and Meryl Streep as her adversary, Mary Fisher.