I was niggled by the thought that it might be Watt Nicoll -- a Scottish singer and writer of (mainly) comic songs in the late 60s and 70s. I was never familiar enough with his repertoire to recognise these tracks posted here, but there is some material on Youtube.

After a while he seemed to disappear from the scene, but I believe he went to the US and trained as a motivational speaker (and maybe even a hypnotist?), working there for many years. Within the past three or four years he reappeared in Britain with the focus on his consultancy work.

I tried to look him up on Wikipedia but didn't get too far….