I recently tried to buy this game, but was redirected to a page hosted at www.sofort.com when I tried to confirm the transaction.
The page said that "This onlineshop is not yet configured to accept payments from the selected country (United Kingdom)."

I just thought I would bring this to your attention, as there seen to be no other threads here on this issue.

Which payment method did you try to get that, Instant Bank Transfer? I can ask BMTMicro about it.

I'm fairly sure Paypal, Google & Amazon Checkouts and Credit cards work with UK too, but do correct me if I'm just being too optimistic.

Yeah, I tried Instant Bank Transfer.

BMTMicro replied that "Wire transfer in Euros" payment method should be used in this case for now. It would seem that Instant Bank Transfer option through sofort.com is only usable in Austria, Belgium, Germany, Netherlands, Poland and Switzerland at this time.