She's your BFF, your Bestie. Thelma to your Louise, or Eddie to your Patsy. This month on Late Night Woman's Hour, Lauren Laverne discusses female friendship, its rules, strengths and weaknesses, and how it changes over time, with psychologist Terri Apter, novelist Lucy Caldwell, Into Film journalist Ceyda Uzun and Julie-Ann Richards and Sarah Adams-Greener, two Woman's Hour listeners who have been friends since they were three.

This programme is available in two versions. The long version is podcast only and is available by clicking the MP3 button on the Late Night Woman's Hour programme page or subscribing to the Woman's Hour daily podcast. The shorter broadcast version will be available on Iplayer shortly after transmission on Friday 25th November.

Lucy Caldwell's collection of short stories, Multitudes, is published by Faber. Here We Are, Lucy's short story about two young women falling in love in 1990s Belfast, first appeared in Granta.