Trumpy,

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What is the "helmet" over the top of the Surge Diverters in Pic 5?.
Is this to prevent Corona Discharge with double conductors?.
What type Insulators do you guys use at these voltages?, as they seem rather thin.
Just my opinion.

Sorry, I can't help with any details, for me anything over 12V is HT now. I did once have "hands on" some insulator strings in the Uni. HT lab, but that was too long ago :-)

I'd be interested to hear any technical details though too, along with any more information about the tunnel (Thanks Hutch).

Ian.