Electricity in England

England has its unique set of problems and concerns around electricity and their energy consumption. Companies provide electricity, and historically is has been safe to use a generator. With modern times, the way electricity is delivered and the data and understanding around it shifts to a certain degree. Like what do you do about areas where there is no electricity? Doe the electricity harm computers or electronic tools? Do you need batteries or flashlights when the lights go out. Other questions arise as well, like what's the household AC electrical power mains voltage within the UK?