It would be useful to have periodic reminders sent out as I've noticed a recent lack of activity despite lots of spaces available.
Also, once a space has been booked, the system still allows the space to be made available again by the owner: for example, they may have forgotten that they already loaned out the space, hence causing double-booking.
It would be nice to have the car park system integrated with the holiday booking system so that spaces are automagically added as available on those days.