So I got my answer to the parking question. No reserved space. Booking a bay only gives you discounted parking.
Below is their reply. I'll have to think of some other way of getting there now.
"Thank you for contacting us.
As with any of our bookings, this does not reserve a car space in our car park. Our Monthly Subscription package offers reserved car spaces, but this takes time and preparation to reserve a car space.
What you will receive when booking online is a discounted price for parking, which is paid for in advance. If the car park is full, we try to honour your booking at a close by car park that has availability at no extra cost to you. Alternatively, we are happy to refund you the cost of booking. Unfortunately due to people overstaying their booking times, or an overflow of casual parkers - we can not guarantee a car space 100%."