There is a health centre near me were midwives are based, I don't otherwise go there. They have a car park which is free, I've parked there in my previous two pregnancies, but not for about 18 months since.
Last week I had my first antenatal visit there for a new pregnancy. It was chucking it down and I had a little one. Driving in there were no new notices/ signs. I parked as usual, glancing up at a sign at the end of the row: 'Free parking for patients and visitors', then dashed in. The sign looked like many in local supermarkets, e.g. 1 hour free parking etc. No signs on entrance or indoors, just the roughly A3/ A4 size ones on the perimeter of the carpark, which I didn't walk close enough to see the bit under the bold text.
The new car park rules however are it's only free if you find a machine and key in your registration. I've never seen this anywhere before, if I'd gone closer to a sign and read the smaller print I would have seen this (no idea where the terminal was itself). Signs were smallish. Maybe if it hadn't been raining/ a familiar carpark I would have though to walk over to read a sign, but in a rush and a bit late I honestly didn't think! I've never had a parking ticket or fine of any kind in my life as I really do try to be careful. It just wouldn't occur to me that a carpark where you cannot buy a ticket/ pay for parking would have a terminal to locate.
A week on there's a photo of my car driving in and out (16 minutes) and a £100 fine! I can easily prove I was there and why with my notes... do I have a chance?