I have parked in the priority area frequently over the past 2 years as I have a 2 year old and the additional space, cleanliness and convenience of the priority parking area has always come in very useful. One problem though, I always book and prepay online, but when I go to the exit barriers and insert my ticket it always says I still owe money on the booking, I then have to buzz the attendant, who checks my booking and raises the barrier. This has happened ever single time I have used the priority parking facility, which is strange. Any idea why this happens ?? This isn't a complaint, I'm just raising the issue to see if it can be rectified. Many Thanks.