I used an NCP car park twice successfully. The third time, 3 different machines all refused both cash and card payments. Other customers tried, too - and had the same issue. In the end we all gave up. Two weeks later I get issued a fine. So, I'm fined for being unable to pay when their machines were broken, even though I'm a previously paying customer. Their customer service is terrible. I entered an appeal process and they shut down all channels of direct communication. When my appeal was unsuccessful (despite my providing evidence), they immediately handed my fine to a very threatening debt collection agency and the fine had doubled - with no explanation. So, I was punished for daring to appeal my fine. Their parking meters are very unreliable, as is their mobile app. I would advice anyone reading this to avoid parking in an NCP car park if the machines show any signs of not behaving properly. Don't bother appealing a fine and don't waste your time with their customer service. I'll personally be avoiding in the future.