This isn't how the market works in the UK, or anywhere close to it (because distribution is heavily consolidated).
The main change has been energy prices (it is complex because supermarkets stopped selling some products, so the price recorded is not what consumers experienced because the product largely wasn't available).
Also, just generally, that isn't how demand for food works either. It isn't elastic, there are substitutes for every product. The main factor driving differences between countries is usually the structure of the food supply chain and exposure to trade.
The main change has been energy prices (it is complex because supermarkets stopped selling some products, so the price recorded is not what consumers experienced because the product largely wasn't available).
Also, just generally, that isn't how demand for food works either. It isn't elastic, there are substitutes for every product. The main factor driving differences between countries is usually the structure of the food supply chain and exposure to trade.