Since posting about the elusive Nicholas (aka Nick) Lampe I've had an email from Robert Thompson in Melbourne who has been trying to research the 70s singer-songwriter for some
time. He has contacted several personnel from the album, but they all say they lost contact in the 70s. One said Nicholas Lampe was working as a social worker on the East Coast in the 70s.
It sounds as if Nicholas Lampe may've done a J.D. Salinger: as Robert points out, he might've just turned his back on the music business and chosen to be left alone. That sounds likely, and I guess that's as much as we can add to the Lampe file for now.
(Update: See At Last: The Nick Lampe Story.)