This will be based on the recent concerns of greater risk of cuts which have reduced, but there always remains a possibility.
Not only due to recent world events, but cuts could occur at anytime due to various reasons - ideally resolved quickly
There are also of course planned cuts when works are required, which you would be informed of anyway but are ‘easier’ in that you know what to prepare for.
The letter should cover a range of needs to consider, and some of these can be added to your records as a priority user.
Key points will be:
Essential equipment if applicable:
What cannot you do without, and therefore what fallbacks could there be?
(eg starlift, hospital type bed, medial equipment)
Heating:
Do you have a single or multiple methods of heating, and any standalone alternatives
(Plug in electric heaters if you are on gas heating, gas bottle heaters etc)
Lights:
Torches, lanterns etc - ideally battery powered etc)
Telephone:
Do you still have a classic landline which would work in a power cut?
(note that most are switching to cable phones and won’t work in a power cut)
Mobiles
Power backup:
Do you have power banks etc, and do you keep them topped Ip ?
(These will tide you over for a number of items)
Mini solar panel
(The ability to charge back up your power banks and equipment)
Invertor
An option to get 240volts from a battery or solar panel. This is a step along the way but will be limited to last as long as the power source (These can be good as a combination of a car/leisure battery, a top up solar panel and an invertor)
Generator & fuel
Pretty much the last option to get full 240v
As a priority household these may be provided on loan by your supplier if you have essential equipment (which is obviously easier for planned works)
Emergency services:
If there is a need then hospitals etc have arrangements for generators