This is one of those "how long is a piece of string" posts. There's no one "correct" answer - it's going to be a mixture of many things, and a good number of them are subjective because they depend on how people view and interact with the NHS, and the opinions that guide those interactions.
I do think it would be helpful if people were given information on the actual costs of their treatment every time they are given treatment. Even if it's just comparison figures. Some of this stuff is easy: Pharmacies could easily print the ACTUAL cost of the drugs that are prescribed on the carton of meds (this happens regularly in places like, for example, the USA, where the prescription co-pay is listed, along with the actual cost of the drugs that was billed to the insurance company etc etc. Some of those are incredibly eye opening: for example when I had spine surgery in the US the cost of the numbing/soothing patches for the skin next to my surgery site was over $1,000 for a pack of 10 patches. The pain meds I received were relatively expensive EXCEPT for an IV administered (i.e. injected - not tablets) version of paracetamol which cost a fortune compared to, for example, IV morphine (which is cheap these days given the age of the drug).
This would be easy enough for the NHS to do - the drugs costings are all in the med books that each GP has in their office (you can ask yourself next time you see them how much the drugs actually cost - they can tell you direct from the book).
Other costings - like how much it costs to see a GP, or a consultant, or basic procedures etc are more subjective/difficult - but they could put basic comparison costings next to them. For example, an out of pocket GP appointment in the US would cost somewhere in excess of $600. Or, if you use the "private medicine" comparison in the UK: a private consultation with a spine specialist in the UK at a private hospital would set you back somewhere around £250 (.increasing to over £450 for some of them at my local private hospital).
Here's a stark example for you: I had a microdiscectomy surgery done in the USA. The cost, before insurance, was over $130,000 - for the surgery and two nights in hospital. The NHS wouldn't have charged a penny out of pocket. You can get a private microdiscectomy surgery un the UK starting at around £20,000 (depending on days spent in hospital, scans required, meds required etc etc - note that no private hospitals can do emergency discectomy surgery).
The UK Is also dealing, as are many other countries, with the perils of a population that is increasingly obese and diabetic. Over a quarter of the population is obese. Two thirds of the population are overweight generally (that figure includes people who are overweight, obese, morbidly obese). That is a staggeringly awful figure in terms of national health.
Diabetes Type 2 (the diabetes variant that is typically caused by an unhealthy lifestyle) treatment alone (dialysis and insulin together with the various equipment and tests required) costs the NHS an absolute fortune every year. meaning that the British population's increasing desire to eat and drink junk is costing all of us a fortune and causing horrific pressures on the NHS. Our local village hospital, where people use to go to recuperate after an operation (i.e. elderly having a hip operation who needed a bit of building up between hospital and going home) has now been taken over by a giant dialysis unit! Meaning that people are no longer able to recuperate in their own village, close to home and their support systems. The concept of local village hospitals has been utterly devastated, which again has cost all of us a fortune and impacted community healthcare in more ways than just £££.
Add smoking, booze, alcohol, and a lack of exercise to the problems and you've got a recipe for future disaster unless something is done to drastically change the way people eat/drink and the fact that so many have a sedentary lifestyle. It's not just an age issue, it's a population lifestyle issue. Indeed, many elderly people have a far better diet than young people these days. Spend a few days at a school or college and you'll get an idea of the problem: the kids eat junk and drink monster/redbull and a variety of other horrific synthetic/artificial/overcaffeinated crap. The NHS is dealing with the impact of that already, but the future costs are going to be astronomical.