Fair enough - so were people only experiencing the 'mild shocks' when touching this path to ground as well as the urn? Even if that were the case, in the absence of faults, I presume that the only path for any current would be through the 'tiny capacitances' I mentioned, which presumably would limit it to a very low level.In the chapel the water tap, lead pipe up from the ground, was next to the urn so a second point of contact with very low impedance was to hand.
Kind Regards, John