Thanks, i like the transformer idea, though i cant find anything on Farnell or anywhere else.
The three DCDC modules are about £3 each, and the 5V wall-wart is about £5, so its the cheapest way i've found so far.
I wonder what would happen if someone held the output probes in each hand? Its hard to see them being seriously harmed, but its so hard to tell?
It does need to be >60V for the LED voltage, but then we are stuck with this danger.
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Also, for ESD resaons, do you agree that the 0V output of the entire system should be connected to earth ground?
(as in the amended schematic)