My Tesco shop used to be roughly 100 items for £100... now it is a third to a half more expensive. Some things which we had as a standard shopping item such as Honeydew melons at 89p are now £1.89 and a rare treat when on offer (offer is currently still £1.19). I know its out of season but it's the same in season!
If you are time rich though then there are so many things you can do to mitigate the prices, but you DO need to be time rich , and have garden space and those factors cut an awful lot of people out.
I've really been working on our self sufficiency for the past 12 months, but I know this is impossible for most people. We live in a rural area, have a large garden and I'm time rich which is a total luxury.
I grow as much of our own veg as possible - including things like peppers and sweetcorn, beetroot and French beans. I'm hoping to up our growing space next year.
We have 2 apple trees and September is spent coring, peeling & blanching 100s of apples which go in the freezer. I make compote every couple of weeks with added foraged blackberries and we eat this with home made yoghurt every day.
Foraging - blackberries, sweet chestnuts, wild garlic, sloes - you name it and preserving them.
Yoghurt, I use a large whole milk at £1.45 and that will make about 2-3 litres of yoghurt.
I also have a contact who is about to start providing us with rabbit and pheasant! He has permits for farm land where numbers need to be contained and using the barter system, they won't cost us anything (but I will have to learn how to butcher!)
I love the lifestyle and it's hard work, going back to skills we've all lost - but I know that I am very privileged to be able to do it. Our society and economy isn't set up to allow most people this freedom.