Just to add my two bob's worth....
I joined the team in the ML FSC late '79. A copy of the tape was held in the centre for replay on the old Tandberg on the watch super's desk.
Evidently the content of the recording was analysed, but I understand nothing conclusive could be drawn from it
For those who know the FSO involved, a cool and professional operator.
I probably missed a reply to an earlier Q, but, anyone know how Strobes is??