She was born Sheridan Ebbage in Drayton, Norfolk, the eldest of four sisters.
She earned a teaching certificate from Keswick College of Education, and worked as an art and English teacher in Norwich schools from 1979 to 1985.
Starting in 1980, she worked as the business manager for her husband Chris Winn and their company Chris Winn Associates, which produced the cartoon "Mad Gadget" for the Young Telegraph.
They produced a "Mad Gadget" computer game (1993)[3] and book (1995).
The series is popular in Germany, and has been adapted into a German-language film Vier zauberhafte Schwestern [de] ("Four Enchanted Sisters", 2020), directed by Sven Unterwaldt Jr.