If you can get it on TV, and have your spokesman say "I've spoken to <insert actual name of actual person with DNO engineering responsibility for your area> and he refuses to do anything about it" who knows what might transpire...
Just an update for anyone interested in the result. The electricity company came out at 9am the next day and patched in a new section of cable, though I would note that they didn't bury it any deeper than before.
I didn't have to pay as they say it should have been buried 18 inches at the least.
Bit of a scary lesson - the depth of the cable is so shallow I could have hit it at any point even if I weren't laying a drive e.g. planting a shrub.
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