DougMash at New Wave Outpost unearthed on YouTube a 10-part documentary of XTC recording with a then 25-year-old Lillywhite in 1980. It is fascinating to watch if you're want to get a sense of what kind a hands-on producer Lillywhite was (and perhaps still is). Looks like a lot of fun.
This is Part 1.
The remaining parts can be found on this page.