Harry I'm doing the Sim Assessment in September (they are totally booked up ie nothing available before then), a friend of mine is soon to do his interview at Waterside and another about to resit day one. Given that anyone sitting the sim in September is going to have to provide three months notice and take care of the referencing etc I would doubt that any of them will receive a start date before the end of the year. I'm also led to believe that they are more or less finalised with numbers for the remainder of 2015.
Therefore I would hazard a guess that any positions from this point on will be hold pool for 2016. How that affects the next window of opportunity for applications will obviously depend on how many that are being churned through right now manage to pass. However they did say during my presentation that the numbers estimated for next year are in the region of 300 again.