MMario: I'm just saying Kate Tickell's rendition is copyright. (I think) it's OK to download it for personal use (e.g. learning the tune) Once you know how to play it, please do so with gusto!
I have a web site that contains lots of Northumbrian folk tales, tunes, lore etc. but I don't think the tune is anything to do with the poem about the famous battle once fought there. I may be wrong, I often am ... ;o)