Hutch,
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In common with most of the HV and MV lines I saw, there was no grounding wire provided above the phases.
The potential wire provided above MV and HV lines, is only really used in areas of high Lightning occurence.
We have 110kV and 66kV lines here that are for the most part, along their length, unprotected.
Not to say that is necessarily a good thing, but it also depends upon the quality of the Surge Diverters on the lines in question and the Earth Resistance of the soil.
Now Ian you would have a better idea of the soil there than me. [Linked Image]