Something I forgot to mention is possibly contacting the hospital. Something like PALS will probably be able to help, or failing that make a nuisance with yourself and the CEO (will probably be his secretary, but it works). You could possibly mention that you know someone that works for a local paper, and they'd be more than happy to do a story, just saying and all that (don't make it sound like an aggressive and explicit threat). They can actually contact the PPC and tell them to cancel it (make sure you get some paperwork from the PPC stating it has been cancelled so they can't necro it on a slow day). Normally, sympathy will be shown.
It's slightly different but, don't assume the police will side with you in a situation like this.
A person I support was recently served with a removal of goods notice by their housing association for items stored in a communal hallway. They issued a rebuttal notice. The housing association ignored this and turned up one morning to remove the items. There were no court stamped papers and the housing association staff were not court appointed bailiffs. My client peacefully attempted to stop them removing the goods and was physically assaulted in the process. The police told the housing association to leave TWICE during two phonecalls, but they refused... so two officers had to be dispatched. They immediately sided with the housing association and effectively took away the rights of my client, effectively enabling the actions of one side in a civil matter.
So don't assume the police will support you. It's quite possible they might advise you to pay the fine and attempt to get it back later through legal means if you feel it's unjustified.
I remember that and replying to it, but there's different circumstances. Your client was trying to prevent something that had been authorised, and was legal.
When it comes to little old ladies the police generally tend to have a heart, especially when it's someone who has no legal right demanding money and them refusing to leave. This essentially makes it trespass, and while still a civil offence, the police are more likely to remove the agent from the property to prevent a breach of the peace.
Makes me wonder why anyone should pay for parking on private land ever?
To be honest private carparks which are explicitly ticket on enter and pay on leaving I don't have a problem with. The only time I've had a problem was when I forgot where I'd parked in a multi-storey and ended up with the exit window timing out, and the barrier refusing to go up, and one of the guys who worked there just used an override key.
My issue is when the parking is initially free, but has some sort of limitation that is unenforceable. I've seen restrictions on going off-site, and it can cause absolute havoc when you have something like a retail park, which may be split between several different PPCs. There was one PPC that had a term where you could effectively go into a shop on the retail park, and would then have to depart the car park for two hours before coming back to go into the next. It's also classed as off site if you go into a zone which is owned by a different PPC. There's an invisible line you can cross without even realising it. That's not to mention that confining someone to a certain zone without cause, other than you want to slap a speculative invoice on them, is probably illegal anyway.
If I've overstayed at a car park that's free for the first 2 hours, and then £5 per hour or part thereof after, then send me the invoice for the loss. I don't mind paying it, because it's just and fair, and even add a quid on for the post. I'm unlikely to argue over whether there was loss or whether the PPC has the right to claim on the landholders behalf.
Don't say that parking is free and then send me a bill for £50 (or £100 if not paid within 14 days) because I overstayed by 10 minutes when it was Xmas and there was a huge queue on exit. That was slapped down as a "goodwill gesture" when I sent them the video from my dashcam (at least them expediting the matter meant it hadn't been overwritten) showing I was queueing to get out at the time, and asked what the probability was of a judge siding with them given the evidence.