Thanks for posting this. I'll need to update the OP when I get time. To my knowledge all the people that got a refund had ordered a Neptune and were most likely allowed refunds.
The route going through the police sounds interesting, but I don't feel confident enough to do it yet.

I've sent a letter to KnC citing swedish law (!) now, which gives you rights to cancel the contract NOT ONLY if you are a consumer, but also if you are a business and they do not fulfill their promises or what you can reasonably expect from them (this includes properties they did not promise in the contract, but that you would reasonably expect, e.g. fire safety). The important thing seems to act AS and WHEN you get aware of these facts and demand compensation from KnCMiner so that you reserve your right to cancel.

Last but not least, also called the German "Verbraucherschutz" seems more helpful, but not sure if they'd help me as I'm living in the UK. She said, she's heard about this case before, but doesn't know what the current state is. They had passed it on to lawyers that would look into it.

Finally and interestingly, the EU law is VERY clear IF you are considered a consumer: you can sue them locally in your country of residence (!!!). I think I even understand now how to enforce the title you get from your local court in Sweden.

Anyways, there hasn't been much interest on this thread here, so not sure I'll be updating it as frequently.