Found A Slightly Different Version
I have located a slightly different version published in a New Zealand paper - 'Lake Wakatip Mail', 21 January 1943, page 3. This is a more polished version of the poem.It was put in the newspaper by a W. T. Dalrymple who served with my grandfather in the 20th Battalion, NZ Army.
The following is the link to the poem in the newspaper:
'THE FORGOTTEN LEGION or THE GLORIOUS FOURTHS'