There was a You and Yours programme on Radio 4 the other day, talking about private parking charges and scams etc (I only heard a part of it) and it sounded like a nightmare. I parked in Thirsk Railway Station in the summer to pick up my brother from the train and there was only an app for parking. I couldn't get it to install on my (quite elderly and quite full) phone, so I just had to chance it. It was a Sunday, there were no staff about to ask, and there was only a few minutes before the train so I couldn't keep trying.
I wasn't there for long, and fortunately didn't get anything unpleasant through the post, but the sheer impossibility of finding ANY way of paying was incredibly frustrating. If I'd been catching the train my brother was on, heading to Newcastle for the day, I'd have had to have left the car without paying, and probably incurred a huge parking 'fee'.
I hate, with a passion, any car park that doesn't have a machine where you can either pay card or cash. The 'apps' are unnecessary, and, to my view, a bit eliteist (how are you supposed to pay if you don't have a mobile phone/your battery is flat?).