 After initial conversations between Neil Gaiman (qv) and  Matthew Vaughn (qv) about how to make the film, Gaiman found that  Vaughn was most comfortable with all the action sequences and  adventure bits but needed help with the romance side of the story.  To complement Vaughns style and better capture all the aspects of  the book, Gaiman introduced him to writer Jane Goldman (I) (qv),  and the two hit it off and wrote the screenplay.