Here in U.S.A. I purchased it for $60.00 at a book & music store.
A lot of unreleased material and different/live versions
of songs that were later released. So even THOSE songs sound different from later studio arrangements as they were performed at coffeehouses prior to studio albums.

The 36 page booklet is also very good about her early life as a child,
her teen years and about her earliest years in the coffeehouses in Canada. I'm actually a big fan of her early very folk albums compared to her later jazzy non-folkly styles.

I think $60.00 U.S. currency is about 45 pounds British sterling
(Approximately)

I figure spending $60.00 or $12.00 per CD with a 36 page booklet is a fair price in USA. for a box set.