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Not working for me either.
Hope it's not sold out already!
I couldn't get the website to open on my computer, a Mac, using either Safari or Firefox.
However, it worked fine on my phone, so I think it may be firewall settings on the computer (which I didn't want to fiddle about changing).
If you have a smartphone, you'll have no problems. And they're still for sale at nearly 11pm UK time, so DON'T PANIC :)