The recording of "Time For a Change" that featured in that 1976 radio doco "The Split Ended Wireless Special" sounds like a 1973 demo with just Phil on guitar and Miles on violin. I've asked Phil, Miles and others about it but no one remembers recording it let alone still having the tape. The doco only featured the end instrumental section of the song, plus Miles' intro to "Stranger Than Fiction". No Phil vocals aired.
Maybe one day someone will uncover it.