Reading this (very good) post over at James' More Than Mind Games sent me off on a search - I found what I was looking for.
Eye-wateringly fantastic TV - worth watching every second - especially the bit at the end where Brian acknowledges the most underrated player the British game has ever had.
This is Clough at his zenith. Serious, purposeful, intelligent, audacious and mischievous. And funny.
Behold and weep. Absolutely beautiful.