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 app is still down for me, managed to get one earlier but watching it go up and down every few mins. Demand or someone didn't test the backend enough
@ljpuk @jamesthomson The app wasn't working properly for me on multiple devices (and still isn't), it was only the website that would work in the end.