@Crypto Monad (and others): that horse has its head in the sand
Here are some words of wisdom from the Openreach Mildenhall page:
"If there is a power cut this will mean – just as if you have a cordless phone today – that you will not be able to make or receive calls.
Most people in the UK have a mobile phone, so the advice is just as you do today, use this as a backup in case there is a power cut.
[...]
If you plug other devices into your phone socket, like fax machines, healthcare alarms, burglar alarms and security systems and text-relay phones, these will also not work over the phone line in a power cut."
For those who can read, the more detailed implications are detailed in the RAE "Living Without Electricity" report from 2016 mentioned earlier.
For those who prefer someone else to read it for them so they can Youtube it, Professor Roger Kemp (one of the team that produced the RAE report) has kindly done that - a 40minute lecture on some of the highlights, find it at
https://www.youtube.com/watch?v=_pehBTjB38o
You probably need to be able to watch *and* listen, for best results.
It'd be nice to think BT/Openreach will make a better job of Mildenhall and beyond than they did with the abandoned 21CN Voice project. But I'm not going to hold my breath.