Just received my IUP paperwork from Barclays.
Just a quick tip that might help those using the programme, my first installment comes out on the 22nd of each month starting from Oct which means by August 22nd 2017 I would have made 11 payments which is the minimum payments you need to make to be eligible to upgrade to the next model.
Barclays will allow you to change your payment date once a year for free (£10 if you need it change it more than once).
So as long as the iPhone 7s/8/10 is released before 22nd of Sept 2017 then you should be ok to upgrade with the minimum 11 payments, but judging from things that could go wrong i.e lack of stock, reservation issues I've moved my payments to come out on the last day of the month 30/31
This should hopefully give people some extra time to get their upgrade before a 12th installment is made to Barclays