On a couple of threads about the authorship of the song that Fay Hield is now singing and that is on Jon Boden's song a day project.
there has been a mention that a Sheila Lewis set a poem to music to give the song?

The earliest song I've come across is by Adam Faith and credited to Trevor Peackock (the actor and songwriter) and John Barry (composer and arranger).Youtube Adam Faith

Has atone any knowledge of Ms Lewis?

The song somehow got into the Forest camps songbook where Jon Boden learned it for campfire singing.