stonham graduated from rose bruford college in 1977. stonham has a master's degree in screenwriting for film and television from royal holloway, university of london. she was a member of the regular cast of jasper carrott's bbc tv comedy sketch show "carrott's lib" in 1982. she co-created and co-wrote series one and two of the bbc radio 4 series "robin and wendy's wet weekends", and was sole writer on series three and four. she took the part of wendy mayfield opposite collaborator on the first two series simon greenall as robin mayfield.