Nothing.
The concept is that provision for local amenities is built in with planning. If no one uses them they will close down. No one is being forced to use anything - like you if you want to go further away fine.
The fact that most areas of anywhere with a certain number of residents have an increasing number of branded small supermarkets, as in your area, shows that at least a certain number of people value them and use them.
I still can't see why you are so against the concept of planning for a few amenities within 15 minutes of housing. It will benefit some, and not others. If it benefits enough, the amenities will stay, if no one uses them they will close down. Experience in recent years is that the likes of Tescos, Sainsburys, and Co-Op local stores see increased usage, hence their expansion in numbers. None of those chains are distraught if you would rather travel to a larger version a longer distance away.
It may be in planning regs, but in reality it does it really happen? I know of at least one in my area where it didn't, ironically it would have put a Morrisions local within 5 minutes walk of my house. However, and this is an important point as that brand is now one of the three from me but further away than planned, it is still far more expensive to shop there than the large supermarket branch 3 or so miles away.
I don't want to derail this thread but it is important to state that SAGE ( Scientific Advisory Group for Emergencies) are there to make recommendations to the government. SAGE is an advisory group and does not make decisions or set policy. Government considers a range of evidence when making decisions including economic, social, and broader environmental factors.
really? You think that a UK political party will bring in a law , outside of a dire emergency, telling you where and when to shop? Where and when to leave your home? Where you can and cant live? That seems outlandish.
Not everything is a conspiracy - not everything is connected.
In 2019 if I said to you within a year we would be told to stay at home, many businesses would be closed and police would be out and about following walkers in Derbyshire with drones, or stopping people cross county borders in the middle of moorland, or people would have to queue in the rain standing on 2m separated markers to buy their groceries, you'd be saying exactly the same to me.
As I said earlier, I have never said that the concept of 15 minute cities was designed to apply any kind of restrictions. But what's to keep a future government from declaring a nationwide climate emergency / crisis / apocalypse, then using similar legislation to the covid stuff? I'm not saying it will happen, but politicians got a taste of what they could do back in 2020, that's a political memory that won't entirely go away. Basically what I am saying is I don't trust politicians with this kind of stuff any more. It would potentially much easier to try to limit what and where people do stuff, be it directly or indirectly, than actually getting to the bottom and solving the reasons why most people don't walk or more importantly use public transport.
Call it conspiracy if you want, I just call it a cynical response to actual events.
So you've just admitted that it is possible to live in an area that has amenities within a 15 minute walk! You've also just illustrated that you have a choice and that you exercise that choice by opting to go slightly further afield because it's cheaper. However, you still have the option to shop more locally if you so desire. Not everyone is going to be physically capable of walking that extra 20 minutes and not everyone has a car, so those local places will be vital to some.
I've said there are amities that are far more expensive. This is a crucial point.
I have two convenience stores within a ten minute walk. I don't do my weekly shopping there for precisely the reasons that you've outlined - it's cheaper for me to drive into town once a fortnight, get everything in one go and drive home again. However, if I run out of milk or if there's something I've forgotten, I'll quite happily walk to one of the local shops and buy it there. Is it more expensive? Yes, it can be for certain items, but I value the convenience of having the nearby option and I'm also supporting two independent business owners when they're finding it quite tough in the current climate.
Yes there may be amenities close by, but they are too expensive to be able to buy the bulk of your shopping, which for the most part is always going to be true of local retailers. They have neither the buying power or space to be able to compete with larger retailers or stores, and if that doesn't change then they will still be the first choice.