You can find several versions of the (prose recitation)'The night of the King's castration/Saga of Daniel/ballad of 69000' at Llewtrah's bawdy song site, but none of them the version I remember from schooldays.
You may find Piss Pot Pete as well - I haven't checked

Sorry I don't have the URL to hand,but I have posted it here in the past. I think it may come up if you search google for 'saga daniel'