I happened to be in a privately managed car park this very morning so I thought I'd check out the sign.
View attachment 605689
Profiteering, or ensuring fair access to limited parking facilities for patients who may require it?
Note the big typeface, then the littler one, then the small print. It is a bit tiny and does lack contrast. It could be clearer although the main message above it is pretty obvious. I'm also not a fan of the 'PCN' initials or other copycat branding on parking charges. They should be a bit more upfront.