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Here is a still of the American female vocal group, The Three Degrees performing on ‘Pebble Mill at One’ in the Foyer (Studio C). The line up of The Three Degrees changed over the years; they originally formed in 1963.
It probably dates from the early 1980s.
The following comments were left on the Pebble Mill Facebook:
Tracy Crump:’ yep got the signed scripts from that one’.
Keith Brook: ‘I vision mixed that item. We pre-recorded three tunes and I still have the video!! John Couzens and Jim Gray were two of the cameramen. BTW, it wasn’t called Studio C at that point.