All was going well until i tried to leave the car park and having pre- paid, a further £175 was demanded After two attempts i finally found a machine which connected me to a person, ( no reply just buzzing sounds on the first two machines I eventually speak to someone and quote the payment number "Your in a different car" he says, no,... we changed the car five weeks ago and changed the registration and colour on your website and i have a print out confirming the new registration number" "Oh, yes, we have not updated it" Try again and i will let you out..... so i walked back to the car, If it had been raining i would have been furious, if it had been my wife traveling alone i would have been furious. After the fifteen minutes delay, the walk back to the terminal and the admission of error, there was no apology or even concern that they employ people who are incompetent and it sounded like they couldn't care less. Someone spent a lot of money on a system which should be easy and convenient then hired muppets to stop it working.