Tracks 1-10 are taken from a live performance at Eric's in Liverpool on August 13th, 1977. (The cover wrongly notes: BBC Sessions 1977)
Track 11 is taken from a demo session at Swindon Hall in March or April 1979, which was later released on.
Tracks 12-17 seem to be taken from a cassette tape of rough mixes from the sessions.
"'Disco" (better known as "Sleepyheads") is a instrumental mix, and "When You're Near Me I Have Difficulty" features a count-in. "Officer Blue" features less vocal overdubs.