Yep Don’t we all… On the roads (highway) and private land are two different things and two sets of rules.
A blue badge is only valid for the highways, not a car park on private land or a private road, that’s not in the local (TMO) so companies enforcing that are doing so unlawfully.
Our local hospital now charges blue badge holders as well.
One used to take your badge to the office with the barrier ticket and you’d not pay, now you treated the same as the able bodied, if you disabled you also gotta queue to pay (only 2 machines) thats equality for you.
It really depends on what they claiming you caused them loss on.. Thats all they can legally claim for loss.. After all it’s a contractual issue on private land.. Signs must be in place and visable and these are nasty companies, even the appeal is not legit in my exp… They’ll always side with the parking company as they pay the £10 to the independant appeal..and pay who even when it’s about the legality of the claim.. they dismiss your appeal.. then gladstone brooks will contact you ( or some other solictors) when you look the same ppl are on the boards and registered at companies house.. it’s legalised theft.
As for the congestion charge you’d have to check, but in london a hire car won’t be registered with disabled tax, so i think you got to inform them.. beforehand.. like everything it’s prob out sourced to some company that only make money from fines / enforcement.. unless you got a lawful reason best just2 pay , or they prob will then try go to get ccj against you via fast track.. never accept that ask for it to go to your local county court, to a real judge. who knows civil law.