If you try to book a time that appears available in Court22 but the system rejects it, it may be because you cannot leave a 30-minute gap between bookings. For example, if someone has booked from 10:00 to 11:00, you will not be able to book from 11:30 to 12:30 on the same court, as this creates a 30-minute gap between 11:00 and 11:30.