Before I had my blue badge car parks were straightforward. You paid and displayed or took your ticket on the way out.
Multi stories remain the same but pay and display are a nightmare for blue badge holders. Some councils charge, some don't; some are free only in marked bays, some give unlimited time others up to three hours.
You can guarantee when you go into the car park that will have pay and display in large letters but info for blue badge holders in microscopic print that you need binoculars to read. My husband doesn't, thankfully, suffer from the addled brain I have but hr is getting seriously stressed over having to park then find a meter to say what the rules are.
My local council charges, one up the road doesn't so it is only a matter of time, with my hopeless memory, that I end up with a ticket.