Other than the ubiquitous Wimpy Bars, the only chain fast food I remember from my youth is a Burger King in the middle of Truro! I don't understand why the big chains took so long to find their way to Cornwall. Maybe a lack of enterprising locals to buy franchises?
Has that much changed in the fast food world in the past 20 years? The article notes the rise of vegetarianism and home delivery. Also, I'd have thought that the existance of the minimum wage is more onerous than it used to be and the marketplace is more crowded. I'd have thought that the basic principles are the same though - mass produce cheap food that can be prepared quickly and easily.
Talking of burgers, I managed to feed myself and my wife for £2 thanks to UberEats recently! Apparently I'd created an account, but never used it, so was offered £15 off when I spent £15. My burger from a local independent was worlds better than anything from Mc Burger King for not much more than the rack rate at those chains. There seems to be a widespread lack of understanding of the fact that you need some fat in a beef burger though, 10-20% more fat in the beef would have made for a much better burger, which I would have been able to taste better with less garnishes / sauces as standard.