Well this has turned into a right saga. Filled in their little form, got another text saying I needed to submit more info. Went on the form and lo, it didn't work and I had to email them instead. Sent the email, then received further requests for info but nothing more I can send. Next I get an email saying it's cleared and I need to pay the fees, so I pay the fees and it says I need to provide more info again!
Having sat in the warehouse for another two days, I rang up the customs team at UPS today. They said it had cleared and if I needed to book a delivery I should speak to customer services. After a transfer to customer services, they said it still hadn't cleared customs... After much department passing back and forth, they've booked a delivery for Monday. Let's see if it turns up eh!