Received a couple of PM's regarding the day, so just to add my 2 cents. Everything i read on here and the net in general about the day was spot on.
Meet at Dibden in the morning, there were 12 of us on my day. Split into 2 groups.
My group completed maths & pilapt first, then went on to complete a couple of group exercises.
Had lunch, after which the group was whittled down (those who unfortunately hadn't made it through the morning), leaving the rest to have 35-45 min 1-on-1 interviews with one of the ladies we had come into contact with during the day.
General advice would be to relax and stay sharp the whole day, they don't try to catch you out. Maths is accomplishable, just brush up on the basics and get used to working under time pressure.
Still have my fingers crossed regarding progressing to the next stage, and good luck to all applying too!