In addition to the fantastic advice above...
Think about reducing your spending and building up savings. At least 6 months income.
You are wanting to become more resilient
So consider:
first aid course.
A good first aid kit including tourniquet, CPR masks etc.
A good DIY tool kit and learning some of those skills.
Gardening and growing your own food.
Being able to preserve food both with a freezer and without power (pickles, bottling, dehydrating, salting?) supermarket stuff initially, lots of food lasts ages.
Both my mum and dad could catch and prep rabbits but didn't pass that skill on. (War time kids) Mum had ferrets as a kid. But learning about old country skills maybe? Or a forest school type thing? Whatever interests you.
Perhaps having a passport ready, or applying for a passport for any countries you are entitled to? (Would be useful for a lot of Americans and Ukrainians right now for example)
I have gone with most likely scenarios here:
fire (we've had four flat fires in our area in the last couple of years)
Illness and disability or ending up in hospital/A and E
Heat waves.
Car trouble.
No water
Power cuts
Cold (flat with only electricity)
Wind.
Weather becoming more variable and unreliable and extreme.
Unrest/crime (urban area)
We don't need to worry about flooding . If we flood most of the England will be flooded! We live on a hill in a second floor flat!