I'm not going to ask for numbers for the 16th September again yet Julia. Don't panic! :)
Just as an "if worst case scenario" though, are JY likely to leave it until last minute, i.e, end of June when the final payment is due), before a decision is made? If the trip does not happen and I am unable to change my dates or indeed change to another holiday would I be able to carry my deposit over to a holiday for 2016?