Thank's Alison... I've never listened to Jez Lowe (Throw the bricks now!). Perhaps I should, he might even be some distant relative. I assume it's the same song that I'm after the opening lyrics go something like; "I'm a poor man as honest as the day I never was a thief until they caught me."
Someone has told me this refers to the gaol in Dublin called "Durham" for some reason or other, I don't know if this is a leg pull or not.