There is a selection of still images from the series, for those without access to the DVDs, spread across 2+ pages here:

https://lightscamerabackbeat.com/search.php?show=Hullabaloo%20(UK)

(just scroll past the initial "search" boxes).

A few performers included that are obscure/unknown now - Linda Drew (no info); Judith Silver (1934-2010) - released one EP on Topic in 1963, later moved to Israel; Maureen Scott (possibly the same Maureen Scott still active as a Vocal Coach | Singing Tutor, or possibly not?). Also Jill Freedman, later to become a well known documentary photographer in New York, but then residing in Europe and making her living as a singer...