Loads of people prep, they just don't call it that or even necessarily think of it that way.
People buying bits for Christmas through the year (seems a lot of people start in January) are prepping for Christmas.
A lot of people who are afraid they will be moved onto Universal Credit do their best to prep in the hope they can make it through the 5 week wait.
You might not think their efforts are enough to count but it doesn't stop it being prepping.
People prep for their holidays.
Buying bits & putting them away to use months in advance is prepping.
Most people who have been in a situation where they have no water for a few days due to frozen pipes or similar tend to have a few litres of water in the cupboard just in case.
That's prepping.
Then there are groups like 48% Preppers on Facebook.
A lot of the people in that group began prepping back in 2016 but had never previously done so.
A lot of them then found that for various reasons (irregular pay due to self employment, unexpected job loss, illness, getting snowed in, power cut etc...) they actually needed to use their preps for those unexpected situations & decided it was a better way to live.
Quite a few others found that it's more economical if you can afford to buy enough e.g. washing powder on special offer to be able to wait for another good offer to buy again.
It becomes a way of life.
There are also Preppers who have their very own tin foil hats & prep for Zombie Apocalypse/Alien Invasion but they are the minority.
Every Prepper is different & preps for different reasons.
The only thing that is unusual about Mumsnet Preppers is that the vast majority of them are women.
Most prepper forums tend to have more men in them.
Just like people who keep large quantities of cash at home don't go round shouting about it in public, Preppers don't go round announcing they have a years supply of toilet roll at home to the general public.
Why would they?