A Google search shows that Johnny Handle has recorded Geordie Brown on a CD called The Land where the Fells Meet the Sky; I assume it's the same one, I can certainly imagine him singing it.
I've heard Nick Fenwick, who I understand was in Northern Front with Ed Pickford and Mike Elliott, sing it several times (but many years ago!)
Thanks for taking the time to help track this down, everyone - it won't be long before it's sorted, I'm sure!