I'm not an electrician but that insulator is doing absolutely nothing in a38wt0.jpg

Do you have other electrical work to do?

Supply is a 50:50 issue but I'm reasonably sure that once it crossed your property boundary, it's yours to maintain. @[email protected] is suggesting contacting power company to get the info you require from the source i.e. "Am I responsible for the maintenance of the supply to my house?". I tried to websearch for the definitive answer but the results are hard to trawl through (reddit would be better), I'm sure it's somewhere but search results are so shit these days.

There is no disconnection required to repair, even if it snapped the wires and insulation would likely hold the line connected to your house (tree branch might tear it out) but no one would be electrocuted, so the electrician shouldn't need to contact energy company. You can "theoretically" grab those wires with your bare hands as they are insulated - DO NOT DO THIS though as there was a shoddy batch of insulation that broke down in the sun so the top of the wires are live.

If you have other electrical work to do, try to get it all done in one visit. Since you have posted about this house regularly, get some networking cables and other stuff put in at the same time.