Michael-thanks for the link. The blue clip of the first poster took me to what looks to be an interesting site.
Unfortunately due to the fact that I have a VAT return to complete for tomorrow I have only had time to listen to your contribution,which gives the same words in a different order as I have them. The first and only time I heard them sung was at the latest 1942.
My reference to WW1 was a pure guess which I hoped would generate some interest and throw up further verses/details.
Joe.