That will be a design issue and will depend on length of cable run and fixing method reference method (e.g. whether in free air, buried in plaster or under insulation etc.) as defined in Appendix 4 of BS7671. Other factors will need to be considered such as proximity to other parallel load...
Some vehicle's BMS system will restrict charging when temps are low and SOC are high. Ours did that this week when it was -4C - as the SOC increased above 70% the charge rate dropped - though never stopped.
I would expect the output of that to be similar to the MG's V2L - i.e. floating earth. So I suspect you'll have the same issue.
No (to your question in bold). IMHO the "issue" or rather the "safety check" that is correctly being performed by the vehicle's charger is to make sure an earth...
In the UK, you would effectively need to create a "TT" earthing arrangement - I suspect same down-under but you would need to check local regs. It will require N-E bonding at the source, a suitable earthing rod and then RCD protection of the supplied circuit. Suggest you use a sparky to set...
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