Having complied with the instructions upon leaving my car, when I returned to my car at the end of my trip, I was astounded that having read that I should present my car park ticket to the machine and that my number plate would be read to confirm who I was, I discovered that the system wish to charge me approx £100 in addition to that which I had already paid. This was despite the fact that I was 30 minutes early for my book-out time. I noticed that other people leaving the car park were having the same experience despite the fact it was 9.30 in the evening and freezing cold. Now it strikes me, that if you are going to use modern technology to run a system instead of people, you should make sure it bloody well works! The person who dealt with me was very courteous and quick to help sort out the problem with your inadequate system!