As someone who had, for a number of years, the unfortunate task of investigating work-related Power Line contacts and then acting as an Expert Witness for the Coroner (in all too many cases) and for any associated Criminal cases, perhaps it's as well I don't watch populist drivel like Casualty, or my vocal chords would be damaged by raving in disbelief at the TV screen!
CH: I investigated a number of cases of theft of sections of surface accessible live HV cabling from large Industrial sites too, and often the culprits were unharmed - as evidenced by CCTV footage and the absence of bodies. Quite remarkable levels of electrical Protection at HV. There to protect the infrastructure though, not invaders! And definitely not to be relied upon for personal protection.
Best one was when an unsupervised labourer, whilst using a sledgehammer to drive reinforcing rods deep down as part of the foundations for a new 400kV Substation, managing to hit a short section of 132kV rated live underground cable and got away without a scratch. The cost of replacement, however, was huge. That stuff don't come cheap.