Kieth, I will bow to your superior scholarship, but don't see how the piece is a parody of LINCOLNSHIRE POACHER. (Although they both could be sung to the same tune, like THE THING and CHANDLER'S WIFE.)

But a parody, you expect to have similar words. I think Kipling's poem starts something like:

Smokin' my pipe on the mountings, sniffin' the morning cool,
I walks in my old brown gaiters, along o' my old brown mule,
With seventy gunners behind me, an' never a beggar forgets
It's only the pick o' the Army that handles the dear little pets - 'Tss! 'Tss!

For you all love the screw guns, the screw guns they all love you!
So when we call around with a few guns, o' course you will know what to do - hoo! hoo!
Just send in your Chief and surrender - its worse if you fights or you runs;
You can go where you please, you can skid up the trees, but you don't get away from the guns.

Now I'm not arguing, I'm just curious. A parody with a chorus would seem to be a parody of another song that also has a chorus. Is there another version of Lincolnshire Poacher with a chorus? Or with words that run parallel to Screw Guns? Or is there a parallel that I have missed?