Heard Bob Hudson do a more elaborate version of this many years ago. It took about half an hour, and I'm still not quite sure how much was ex tempore and how much he had rehearsed.

The bit I remember is how it finished...

...and that is why you will see, written in letters of gold four feet high, on the wall of BHP's blast furnace in Newcastle:

Don't you ever let a chance go by, O Lord,
Don't you ever let a chance go by.