My version was from Everthorpe 1965 in St Andrews

The judge said step down, boy, and dry up your tears
you're going to Borstal for a term of two years

so kiss me, my darling, and say you'll be mine
for two years in Borstal is a mighty long time

there's bars on the windows there's bars on the door's
make sure the piss pot is polished some more

I've done 12 months now I've 12 more to do
they put me on chokey for slapping a screw

the screws did not like it that I could see
They came after lights out and kicked the shit out of me

I'm a yellow tie discharge so I don't say a word
So on my last morning I shout "JUST DO YOUR BIRD"

From one who was there!