It was actually written by Keith Roberts - a teacher from Wigan who published it in a book of his songs called "The Road to Wigan Pier (and Back)". The song is called "The Cage" and also appears on Keith's LP "Pier of the Realm" recorded on Bill Leader's "Trailer" label - Tra 3031
When I get home I'll find the rest of the words for you - it's years since I've sung this one - might revive it.

Cheers
Mark