I believe this was part of a collection of amateur 1/2" videos recorded off-air in the early 70s that the Kaleidoscope organization purchased and digitized. It showed up online earlier this year and I figured a lot of people would like to see it here - this isn't the same performance as the one found online with John Peel miming the mandolin part. This one is a lot wilder and fun, with the whole band swapping instruments and miming terribly:
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we.tl]