Finally the UK website came up, and I could order fine via that. The app just was completely messed up. I'm in the 27 Sep - 2 Oct window now though for all that delay…
@jamesthomson Surprisingly had a good year this year, last year was a shambles.
Two MBPs pointing to the IUP page, two iPads with the app, and an iPhone — just one device (MBP, Safari) became available about 5 minutes in.
Everything else came online about 1:20pm.