Unfortunately, if a car park is not available online it means that the online booking spaces have been exhausted over your travel period for that car park. You can drive up and enter your preferred car park (subject to space availability on the day), which will incur charges at the standard tariff rate. Alternatively, you could consider booking a different car park if there is one available.
같은 이유로 문의 했었는데 답변 받은 내용 입니다.