Have there been any film adaptations of Heyers works?
Well, technically. The Reluctant Widow was filmed in 1951: see http://www.imdb.com/title/tt0043963/, though it’s not at all close to the story of the book. Arabella was filmed in German in 1959: see http://www.imdb.com/title/tt0052624/. We are not aware of any list-member who’s seen this film, though it’s rumoured to be a very loose adaptation; there are some stills at http://cinema.msn.de/film_aktuell/filmdetail/film/?typ=inhalt&film_id=4942.