Oh typical, once again I have to post the opposite viewpoint
In most cases, I'm all for it. Because people are selfish and will use hospital car parks for their own gain.
Now, before anyone gets too angry at me, I don't agree with some of the high charges. But I do believe that paying for the upkeep of the car parks (a substantial cost that would have to come from NHS funds otherwise) and ensuring that only people who actually need to visit the hospital use it are important.
Saying that, I'm not sure why schemes haven't been drawn up to reimburse people that need treatment. And I also don't know why more hospitals don't do what they did at Bath RUH - when my son was born and my wife was going to have to stay in for a couple of days I was able to purchase parking for one week for £10. This was brilliant. When my gran went in we also purchased one of these and passed it between family members.
Saying that, I didn't actually need to buy the pass when my wife and son were in hospital. As it turned out the barriers went up at the end of visiting hours in the evening anyway (and was true when my gran was in for two months). No official statement is made about this but I'm guessing they know that late in the evening it is just family members visiting, and not people just using the car park for their own needs.