Never heard of that one Sandy.
Harmless eccentricity is fine, as far as it goes - I worry that it is something of a stretch to describe Icke in such terms though. He has many followers, many of whom have a religous zeal for his thought and utterings, and take them totally at face value. And he has views about everything- conspiracy, healthcare, global warming, all of this - and, because of his charisma and standing with his followers, they believe.This can be dangerous, I think, rather than merely eccentric.
David Icke is at that intersection where harmless eccentricity meets dangerous cult leader, in my view.