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@wools
^Too much reading, not enough getting his hands dirty? :P I was the same. I researched it for fncking ages and PM'd various people. They got back to me. It was all inconclusive. So, in the end, I spoke to Cliff at Royce about it and on my way home from Bournemouth passed through the workshop with my cranks. He put them on his JIS and ISO bottom brackets and came to the conclusion that they were definitely ISO. Sure, they fitted on the JIS taper (they're square taper after all), but there wasn't as much contact between crank arm and BB taper. As you can imagine they just stick out more on the JIS.
Can we close the case now please? They're definitely ISO. :)