I'd look at the personal liability section of your home insurance policy. This is the sort of thing you need it for. If neccessary take it to the Insurance Ombudsman.
It's location will be shown on a plan held by the DNO which is open for the public to access or receive a copy of upon request prior to any work commencing.
We had a power failure a couple of weeks ago and they were wandering between ours and the neighbour's garden with cable detecting gear. I now know that our electricity supply travels under two neighbours gardens before exiting on a road round the corner.
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