I really don't understand the obsession with Tesco. I can remember when Cohen started the busiess, and shops looked like street vendors stalls. Vegetable boxes were piled high, and the product wasn't removed from the boxes. Prices were low, and quality was good. They seem to have reversed this policy now. Prices are generally higher than other supermarkets and the quality is lower ( in my opinion). Their marketing is deceptive as well in many cases - a 1 kilo bag can cost more than two half kilo bags for some products.
Lidl started well by having low prices, and stocking products for European immigrants. They bought a lot of warehouse clearance stock as well, and sometimes their fruit and veg was not in its prime. They seem to have adopted the Tesco model recently though, and their prices have crept up, and now there are often better deals to be found at Aldi - their competitor. They also seem to be leaning on their suppliers to reduce costs and quality, and there are health warnings appearing for the pineapples for example. I've seen their bread arriving in Hovis cages, and Hovis is the quality brand that slumped when Tesco pushed them into a major supply deal. As a result of the drop in quality, Warburtons managed to win in the battle for the new slot as quality sliced bread supplier.
Morrisons was a north country grocery chain, and they bought the larger Safeways supermarket chain, and this nearly bankrupted them. They managed to survive, and they created a niche for themselves by continuing the old grocer's marketing concepts, and sold a good range of products. Unfortunately, they appointed a new managing director a few years ago, and he decided to "clean up" their product range, so now they are just another supermarket chain trying to compete on price. Their free WiFi doesn't work either.
Asda was born from the old Associated Dairies milk delivery chain ( hence the name ), and has now been bought by Walmart. Whilst there is a measure of local control, I gather that major policy decisions are made in America.
I could go on with a number of other points. For example, the traditional English chain Sainsburys now has the country of Qatar as the majority shareholder, and they are rumoured to be negotiating the purchase of Asda. Amazon are now moving in on a number of supermarket chains with their delivery and marketing services - many people think they were the cause of the failure of Toys'R'Us.