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So, Canze tells me that the reliable location has 145ohms earth resistance (house is earthed into an old ground rod on the other side of the house to the charge location) and the unreliable one has 45ohms (into a new ground rod next to the detached garage). I did wonder if neighbours' electric usage giving voltage fluctuations or if there was other noise from motors or switching that was upsetting the granny charger. The 32A Rolec charger doesn't seem to have an issue at the 45ohm location.
 

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Co-author of CanZE. Q210 nov 2013
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145 is absolutely borderline, but it supports my point: once it's established to be OK, off she goes. 45 is OK. This does not sound like an earthing problem. Usual suspects are: dodgy wiring (the cables need to be secured hard), chargepoint instead of car tripping on mild overcurrent or leak current, dodgy cable, ZOE kaput.
 
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