C [flaccon] then informed me that on receiving the recording she had not downloaded it but had forwarded it to a friend who would then play it to her over the telephone so she could listen to it prior to D [flaccon's download]. Her friend had then given her a description of its contents, which corresponded to those reported above. This friend was convinced that I had muted the microphone when I made the recording and C was seeking expert opinion on this. I reassured her that the microphone had not been muted. However, she asked for another recording with my voice at the beginning and end and I duly complied, repeating the above procedure.