I've been looking for information on the following song (my transcription and my title), which I recorded from the Folk Roots radio programme, in 1992 while I was in Bournemouth for the year.

I suspect it was written between 1970 and 1990, but I don't really know. I'd like to know who wrote it as well. Thanks for any info.
JPN

THE TEACHER'S SONG (RAP TAP TAP)

When I first became a teacher
I was gentle I was sane
Then they gave me fifty young'uns
And a yard and a half of bamboo cane

Chorus
Rap Tap Tap the old'uns told me
Rap Tap Tap that's what you do
Rap Tap Tap Come lay it on lads
Get 'em first 'fore they get you!

A cane, says I, I'll never need it
Young'uns all respond to talk
I turned to write upon the board
And a lad left fly with a box of chalk

Chorus

The lad that threw that chalk, says I,
Will never live to be a man
He's far too scared to show himself
But he stood, and threw another one

Chorus

To cane a lad's a dreadful shame
'Cos everyone's a mother's son
Take the cane away from teachers, …
Issue every one … A GUN!

Final Chorus
Then a-rap tap tap with your old Lee-Enfields
Hand grenade or blunderbuss
With the Coldstream Guards on playground duty
We'll get 'em 'fore they get us!

Folk Roots, James Bodwyn?