There is no need to say since the advice is for all of us, it isn't region specific.
You don't need to rush out and spend hundreds of pounds, just gradually over the next few weeks build up more resilience, starting with the most important things first.
Water and food are the most important. You can start this for literally zero cost.
Fill any flasks, water bottles and used plastic milk bottles with water and put them in your fridge. - done. You suddenly have a small stash of drinking water.
I know Im harping on about water butts but they really are a good way to store water (and replenish the stock). You frequently see them for about a fiver on Facebook marketplace and some councils subsidise them too (although they are only about £30 full price). I now have four linked together at the back of my garage. They hold 210 litres each so thats 840 litres of water sitting there. So even if it didn't rain at all (unlikely) then that is 280 days worth of drinking water (3 litres a day) or for a family of four that is 70 days of drinking water.
For one water butt at 210 litres that would last a family of four about two and a half weeks.
Obviously nobody wants to drink the water from their garden water butt unless they really have to!