Hang on a minute, mate,
Sure all LV cabling has to be run under-ground, but what is there to prevent the Spur line being extended?.
Provided, that the Spur uses 11kV or a similar voltage, even if it is just extended until it is out of the jurisdiction of the neighbour that will not give the consent.
I hate to be suggesting a thing like this, but it sounds like there are very few alternatives.
Just like the situation we have here in NZ, there is an "easement" clause for HV lines and thier path across land, no matter who owns it.
At the end of the day Paul, the people that are going to live there are going to need a power supply of one form or another.
It seems that things have changed in the country these days, where neighbours helped each other out.
I work with Rural customers all the time here and they would extend thier lines without a thought and they would help setting the poles. [Linked Image]