[2] The basic premise was that Mayo, along with all or some of his "crew" (female co-host, newsreader, producer) would "act out" a scene of just seconds in length, the circumstances of which led listeners cryptically to the title of a well-known hit song, from any era.
The lady certainly seemed to have happened upon the quiz by accident (she didn't "sound" like a demographically-targeted Radio 1 listener of archetype) and Mayo referred to her in a joking manner for several rounds thereafter.
It's possible that the chattering noises could have been misinterpreted for interference on the medium wave which many Radio 1 listeners were still relying on for coverage, with the new FM signal of the time still not yet covering the whole nation.
Having used this piece of production as the announcement of the quiz, Mayo would then play the cryptic clip, give the phone number and state what was up for grabs for a correct answer - this prize was in the form of record tokens (later CD tokens when vinyl records began to become obsolete) starting at one on the first day of a new quiz and increasing by one each day until a correct answer was given.
Mayo would ask each caller who they were, where they were from and - due to habit, tradition, and to give his female co-host a chance to update her forecasts - what the weather was like in their area.