I found this on the end of a reel-to-reel tape, which contained other stuff which would date it somewhere between the mid-1960s and the mid-1970s.

I wonder if ‘Peter’ and ‘Deborah’ are still alive, and if they remember being asked to talk into a microphone by someone, whilst playing in the park?

Initially I thought the address might be 16 Wadham Avenue, in Walthamstow, East London. But based on some of the accents, I think it is more likely to be 16 Whaddon Avenue, in Cheltenham, Gloucestershire.