Top of the Pops, 5 October 1972:
Pan’s People dance to Back Stabbers by The O’Jays.
From the conversation over on the discussion forum, this clip seems to be a rehearsal recording rather than the broadcast performance, which doesn’t seem to have survived: notice the lack of a studio audience, for instance.
Still it’s good to have even this imperfect version to enjoy.
Thanks to Andee Bee for the YouTube post.