Found a few more youtube clips in varying quality:

Esther & Abi Ofarim: 4 songs via this page -
http://www.esther-ofarim.de/hullabaloo1963.htm

Carolyn Hester & Davy Graham - Babe It Ain't No Lie:
https://www.youtube.com/watch?v=Ye45qFZeORw


And a still photo of our heroes recording the show:
https://dianajhale.wordpress.com/2013/09/11/hullabaloo-to-beuys-via-botany/#jp-carousel-3174

(maybe more lurking out there as well?)

- Tony