Hi Nicola
I know exactly how you felt when reading this, though I haven't taken it any further yet, other than to link it in with the other two sites.
I would imagine that the Druids would have known about many other ancient bull-related rituals, and gods, from tales told by travellers from the eastern Mediterranean... the Minotaur and its Labyrinth at Knossos spring to mind. I believe Phoenicians travelled frequently to trade with the inhabitants of Cornwall for their precious tin. (King Arthur's Hall is on Bodmin Moor. Ok, I'm making two and two add up to five....!) In any case, the Celts came over from Europe so would have been closer to the source of the stories, and the Druid element of those peoples were expert at memorising stories and verse....
Looking again at the dowsing plans, I do hope they help can help give us an insight to how the ancient people used their sites, other than by interpretation of the artefacts they left behind.
NB: The writer of the quoted passage taken from his chapter on the Druids from 'Mysteries of the Ancient World', was an 'A. P. Fitzpatrick' [a field archaeologist with Wessex Archaeology].
Something is not right. This message is just to keep things from messing up down the road