Originally I booked in the long stay car park for 7 days as I usually do, but I was offered an "upgrade" to the short stay park outside the terminal building. As we were getting back late, to save the hassle of waiting for the bus to the car park I took up the offer. We were a little apprehensive when we saw the notices saying 3 days maximum stay but the instructions on my email clearly told me where to go so we left the car. On return at 11.30p.m. it was very easy to walk straight to the car, but on arriving at the barrier it would not lift and said because we had overstayed we had to pay. My paper work was in the case, no one was around and it was quite a walk to the office and the whole point of staying in the short stay was a quick get away so I paid £157 at the machine. I e-mailed the next day and was quickly contacted by phone. After a quick check I was told that the automatic number plate recognition camera had made a mistake and the money would be refunded to my card. The matter was swiftly and efficiently dealt with and the money refunded within a day or two.