I remember it well. Not listed at IMDb but read the last few paragraphs of this article:
Who is that masked man? | Sport | The Observer
It was an Arena documentary called Master of the Canvas (1992). Good title!
This reminds me of Bob Hope's joke about his failed boxing career:
They used to call me 'Rembrandt Hope' - because I was always on the canvas!
Just found an extract on YouTube. Sorted
BBC Knowledge is now BBC4.
Added bonus. An interview with Dr. Miriam (Don't Ask Me) Stoppard:
All this and camp astrologer Russell Grant too! What more could you want?

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