IUP is in store to complete, but you can pre-order along with everyone else. the 0% 24m can be done in advance of preorder (usually the evening after the launch event) and that makes the checkout on pre-order day just a few clicks and easy to do.
edit:
its the same credit check/amounts if you go IUP or 24 months... with the 24 months you dont have to go to store and can have it delivered.
IUP is good if you want to upgrade every year and happy to just hand phone back to apple after 11 payments have been made. In reality, you would be a little worse off (if that is an issue) as you can typically sell the phone via a reseller like music magpie, UR or Meelie and get more than apple give. You can then pay off the Barclays loan directly and keep the difference.
also with IUP you have to take AppleCare, with paying 24m/0%.. the choice is yours on if you want AC
I've been toying with the IUP instead of the 0% Barclays credit (and pay off after 1 year) approach I normally do.
I sell (eBay or The Magpie etc) my phone every year so I keep it in as good condition as possible, using a case. Which I hate. Id much rather go naked.
Thats where the IUP with AppleCare becomes attractive (keep your naked jokes to yourself please) - I dont have to worry as much about it being pristine to protect its value. Apple will accept reasonable wear and tear, or fix anything bad with Apple care.
The thing holding me back is that I dont completely understand the logistics. If Im right, I can apply and set up the IUP about a day after the launch (next Monday), and be pre-approved.
Then I go to the Apple website for the on sale day (guessing Friday 13th) and order, where my payment options will include the IUP.
Then on launch day (guessing Friday 20th) I tootle along to my friendly neighbourhood Apple Store, hand over my old phone (they can have the bloody fine woven monstrosity as well) and run away into the distance with my new phone.
Then next year, rinse and repeat.
Does that sound right to everyone ?