The point about the ability to park free of charge in many council run car parks, as well as on parking meters, many railway stations etc is a good one. I sometimes wish that I’d kept a little notebook in the car from when we first got a Blue Badge recording how much we’ve saved over the years. We’ve definitely saved over £1,000 over the years and probably a lot more.
Best example was a short break that we did in York. We stayed in a City Centre hotel that didn’t have a car park but we were able to park in a nearby local authority car park free of charge. Without the Blue Badge the charge was something ridiculous like £18 a day 😱