David,

I've got the album you refer to. Tom learned," the Plains of waterloo" from Martin Carthy. It was collected in the Ottawa Valley by Edith Fowkes.

Plains of Waterloo (1) in the index is the closest to the version of the song as sung by the Ranters. It shares the same outline and some of the same lines.

I can't find a printed source for the lyrics. If you're really stuck, e-mail me and I'll transcribe them, but it might take a while!