Hi All,
To answer my own question, I hadn't! I see that a CD of his music has been released on the Tactus label with the title "Opere per pianoforte" and the pianists Massimilliano Genot and Andrea Vigna-Taglianti. He was court pianist-composer to His Majesty The King of Italy. Having listened to some parts of it on Spotify, it sounds intriguing!
Giuseppe Unia, not Guiseppe, of course. I'm not sure if Guiseppe is a name (well, maybe by typo on a few peoples' birth/baptismal certificates, so a few times)? (Correction: it apparently is a name in German.)
Here's a small amount of information on Giuseppe Unia collected: here (https://imslp.org/wiki/Category:Unia,_Giuseppe).
Thread title duly corrected. Thanks, Eric.
Dratted typos....and I'm currently learning Italian! :-\