Amazon UK DO NOT sell anything. They act as "fulfillers" or a marketplace to advertise, for others who pay the tax on those sales. Try doing a search for USB cables on Amazon. Over 50,000 varieties available. Need an HDMI switch, just 930 types available. Try getting just that level of choice on the high street, and certainly not at those prices. The items I've bought via Amazon have almost all, not been available on the high street, and the other items would've only been available using "mail-order" anyway.
The high street can't cope with the range of items available nowadays. It's as simple as that. AO.com has nearly 300 types of dishwasher available. How on earth could they exist on the high street? Especially if Boris insists lorries and vans aren't to be allowed to deliver the stock. Try getting a large fridge/freezer on the back of a cargo bike.
