Stanron: Yes, I agree about the misprint in bar 1 of the hymnary.org copy. Not quite sure I understand the point about the mode, though. In the hymnal the tune looks like G mixolydian (originally C in RVW's MS), but it finishes on the lower 5th, i.e. unresolved. By throwing a G chord into the harmony you create the impression of resolution, but I don't see how this compromises the mode of the melody.

There are some wax cylinder recordings made by RVW on the British Library sound archive site, but I can't find the Thomas Bowes song there.