The reason it's so hard identifying the problem with the NHS is that it's not one problem, but rather many.
Certainly many parts of the NHS are indeed underfunded. Our local hospital for example the medical wards are massively underfunded, under-equipped and understaffed. When I was in a couple of years back I had to be put on a drip to prevent dehydration, and a syringe driver pumping insulin into me. The drip bag started out hanging from the curtain rail over my bed, and the syringe driver was sat on my bedside cabinet.... At one point I didn't even have a pillow (this was when I finally got a bed to need a pillow, rather than where I started out in a space where a bed usually goes....), they rolled a blanket up and put it into a pillow case... I know this is hard to believe, so I'll attach the pics I took on the sly... The same hospital just built a massive new A&E department, and has a lovely heart and lung center with all of the equipment they could ever want.. Oh look, bad management is kinda suggested there eh? Pour the cash into the "fashionable" departments, starve the less fashionable "god's waiting room" wards (I used to be a nurse, that's literally the nickname for medical wards as they tend to be filled with the elderly, who often never get to leave in life). They had the same problem with staffing, they're all understaffed there (with health care support workers performing tasks that at one time would have been a big no no...), but the staff on medical just had zero motivation, and in some cases seemed to not know their jobs very well (like the staff nurse who insisted I had pudding after my lunch, and told me peaches would be good... I was in there as I'd developed type 2 diabetes very rapidly and extremely as high blood sugars caused my pancreas to temporarily shut down...).
I have to be honest, what I see is a system increasingly top heavy, with people who know nothing about healthcare calling the shots. By the time the managers, consultants and surgeons have been given their slice of pie, there's not much left for front line care. Too many very expensive bosses (probably thanks to this idea that the NHS should be run as a business, rather than as a service...).
But heh, I'm just a very left leaning socialist ex-nurse, who thinks that it's all quite deliberate so it can be sold off and privatised, as is the Tory way. :lol: