Most people in the 20% band are likely living paycheck to paycheck and struggle to sufficiently provide all the necessities they need. A lot of people well into the 40% band struggle with more expensive necessities like housing and transportation.
You seem extremely misguided about life in the UK. Have you actually lived here yet? You make it sound like the entire country is in poverty.
You realise that 80% of the UK population is in the 20% band, right?
Are you seriously telling me that 80% of the UK population lives paycheck to paycheck and can't afford necessities? Because that is simply not true.
Pretty much everyone I know is in the 20% band and none of them are struggling to afford to live. My friends with PhDs and and good jobs are in the 20% band... they're doing fine. My friend working in retail is in the 20% band... yep, she's just fine too.
As to food... US spending on food as a percentage of income is the lowest in the world. Actual item to item price comparison is lower in the US. So, if you believe you'd spend more on food in the US, either you'd be buying dramatically different items/quantities or you're thinking of something like manhattan prices versus somewhere in the North.
I've lived in the US and the UK. Much of the grocery store food in both New Mexico (where I lived) and Arkansas (where my relatives live) is more expensive than in the UK.
From a cost of living calculator comparing Albuquerque, NM (where I used to live) with Lincoln, UK (where I live now), the following are cheaper in Lincoln:
Loaf of bread = 51% cheaper in the UK
Rice = 50% cheaper in the UK
Eggs = 5% cheaper in the UK
Local Cheese = 48% cheaper in the UK
Beef = 24% cheaper in the UK
Apples = 20% cheaper in the UK
Bananas = 21% cheaper in the UK
Oranges = 12% cheaper in the UK
Tomatoes = 27% cheaper in the UK
Potatoes = 43% cheaper in the UK
Onion = 52% cheaper in the UK
Lettuce = 42% cheaper in the UK
Water (1.5 litre bottle) = 24% cheaper in the UK
Bottle of wine = 38% cheaper in the UK
Domestic beer = 31% cheaper in the UK
Imported beer = 55% cheaper in the UK
And the following are more expensive in Lincoln, UK:
Milk = 34% more expensive in the UK
Chicken breasts = 24% more expensive in the UK
Cigarettes = 33% more expensive in the UK
And comparing Albuquerque, NM with Bristol (where I grew up), which has a higher cost of living than Lincoln, the figures are very similar. Going further still, comparing Albuquerque with London... yep, pretty much all the groceries are cheaper in London.
Same for New York and London... in fact, all the groceries on the list except milk are cheaper in London than in New York.
On the whole though, prices are a lot lower in the US and that's largely due to low cost free trade with the whole of the world. Food isn't the point though. It is all necessities. When there isn't enough to go around and you require contribution towards one thing, then by definition something else has to give.
See above. Prices are not lower in the US.
And by the way, I didn't attack the UK system. I was talking chiefly about the US system. When you force people struggling to get by to pay for health insurance when they cannot afford both it and other necessities, then either they pay the penalty with even less to go around, or they have to sacrifice something else.
If you're talking about the US system, why do you keep comparing it to the NHS and talking about people in the UK not being able to afford to live because of their so-called 'high taxes' and 'high cost of groceries'?