Previously, you could finance purchases of £99 or higher with PayPal Credit and purchases of £399 or higher with Barclays. Now, when you make a purchase via the online Apple Store in the U.K., there are no financing options presented at checkout.
Apple does still offer financing options for educational institutions in the U.K. and you can still get financing on iPhones via the iPhone Upgrade Program.
Customers in the U.S. can get financing via the Barclaycard Visa. More details here.