We were offered an for the second time an opportunity to upgrade for an additional charge to upgrade from long stay to short stay this is particularly helpful when you return and can walk to your car and not have to wait for the bus. However on both occasions when leaving the car park we have been stopped from leaving the machine has said card passed exit time return and pay extra or words to that. You then have t wind down your window in the dark and cold try and find the button to speak to an operator then try and find your booking reference then wait for the barrier to be lifted.