In 1989, Jenny Seagrove appeared in an Italian miniseries which was an adaptation of the oft-filmed novel The Betrothed (I promessi sposi). The project attracted a number of internationally famous actors including Burt Lancaster, Franco Nero, F. Murray Abraham, Helmut Berger, Fernando Rey and others, plus a musical score from Ennio Morricone.
This Italian-language television mini-series is fairly obscure, especially to Seagrove fans, and English subtitles don't seem to exist. However, there's always hope that something like this will be made available for viewers worldwide to enjoy.
Here is a promotional image of Jenny Seagrove in her nun costume for The Betrothed: