It was broadcast on ITV on 19 February 2007, starring Catherine Tate, Anne Reid, Holly Grainger and Robert Pattinson.
According to BARB, the show received strong viewing figures of 6.09 million.
Karen's mother, Nan, is suffering from Alzheimer's disease.
As her due date draws near, Charlotte grows closer to her nerdy classmate, Daniel.
In 2008, ABC was developing a pilot known as Bad Mother's Handbook to star Alicia Silverstone, Megan Mullally and Alia Shawkat, but it was not picked up.