We've just booked a stay at a Haven park, arriving on Monday. One of the big perks to book was the swimming pool. In our confirmation, it says you have to pre book the swimming (have a set number of slots allocated to you to book in advance) and then you might be able to book more once on site. We've gone to prebook, and there are no slots available. I've messaged Haven, but wondered on the mean time if anyone else has had this happen? Thanks!