According to Bill Watkins' web site, THE ERRANT APPRENTICE has words by Bill Watkins and music by Andy M. Stewart and Gerry O'Beirne.

Also, the last two lines should be:
"For there's many things worth trying for and occasionally worth lying for,
But there's bugger-all worth dying for, so I'll stick to the single life."
(The first change is essential for the lines to make sense.)