Rain’s Trade List
My own Trade List: Rain Has This has an incomplete filmography as the list page only deals with work I have in my personal collection, but it includes places to stream/buy quite a few PW shows/films.
The Internet Movie Database has a well-updated, accurate filmography.
The Peter Wingfield Fan Club’s filmography is nicely annotated.
Another source for a list of Peter’s TV and Film work is Wikipedia.
PW’s own official website lists his film credits!