I'd guess something like that would be one for spotting from the air - crop mark stylee. Once a cut figure had grassed over, and been subject to hillside erosion, I doubt they'd be much to spot on ground level. Probably a good place to start would be with suspicious looking place/hill names over looking known routes over the landscape.
Y'never know. It might turn out that carving figures into the sides of hillforts was as common as burial associated rock carvings in the Bronze Age... just that being perishable, many didn't survive or were 'rubbed out' for political/religious reasons? It's a thought.
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