As already mentioned, there are two aspects that need addressing.
One is the people who don't understand the difference between "free" and "free at the point of delivery". I'm sure some don't comprehend that it costs money to run the NHS and that money has to come from somewhere.
The other is the sheer inefficiency which comes from trying to run the NHS as a business. I think the rot set in when it was decided that an efficient hospital was one that had the fewest empty beds. A hospital is not a hotel! A&E gets backed up with patients for whom there are no beds - so A&E have targets imposed, leading to increased stress for staff who are already stressed by the "free" people.
My local DGH is near to a mainline railway and a motorway. If there is an incident that requires beds for more than a few people, then they'd struggle to find enough beds - probably have to clear out the day surgery unit.
In my last job at the DGH, we had an amazingly efficient departmental secretary, who kept sufficient stationery supplies for all our needs. But no more than sufficient, because there wasn't enough space for extras. One year, the Trust was facing a deficit in the year-end accounts. So they decided to stop all stationery orders for a couple of months. Never mind that secretaries had to trawl around other departments, begging for stationery, wasting goodness-knows-how-many woman-hours. Never mind that clinic letters to GPs were typed, but couldn't be printed as there was no paper. Never mind that stationery was then ordered in the next accounting year so the costs weren't avoided, merely delayed. And, like Tiredemma says, all the stationery could only be ordered from one supplier, who then got overwhelmed once stationery could be ordered once again. I know some consultants bought paper so their secretaries could print out clinic letters.
And I don't even want to start on the antiquated admin "technology", otherwise I'd be typing here all night. There were solutions - but that would have meant actually listening to staff, especially those on the lower levels who did the grunt work. But we were "costs" rather than "assets".
Apologies for the lengthy rant.