Thomのエクセター大学在学中に所属していたHeadless Chickens、またFlicker Noiseの映像が突然Youtubeに。
収録はそれぞれ80年代後期、90年、と記載されています。

'High and Dry' performed by Headless Chickens, feat Thom Yorke

'I Don't Want to go to Woodstock' by Headless Chickens

Contemporary Classical Concert 2
from the description : I think this piece may have been called Flicker Noise, written along principles of semi-random compositional techniques (hence the rolling of the dice).
Among others, this piece features Thom Yorke, John Matthias, Simon Shackleton and Andy Bone.