Your post reminded me how much I've wished it were possible to get hold of Greenaway's A TV Dante (1989), with Bob Peck and John Gielgud as Dante and Virgil respectively. I saw and loved it on TV when it came out, and it's very clearly the direct predecessor of Prospero's Books, but was never as far as I can see put on DVD.

Anyhow, I just got to googling and I see that it's now available to download, at Digital Classics. I definitely recommend it, if you're tracing the Greenaway trajectory. Maybe a treat for after the moving crisis?