As to my question about mobile coverage?
In my fairly urban built up town when we had a longer term power cut in 2017 (about 6 hours) the mobile masts of Three, EE, Vodafone and O2 all stopped working. Virgin Media connections stopped working, and only ADSL and VDSL/FTTC worked.
The UK isn't the only country ending exchange provided voice and volts, most of Europe is doing similar.
23 years of broadband connectivity since 1999 trial - Live BQM