It it is an obvious failure, and a general 90% discount clearly is, contracts may be canceled at any time. Additionally, if you read the terms, online orders ar

It it is an obvious failure, and a general 90% discount clearly is, contracts may be canceled at any time. Additionally, if you read the terms, online orders are often just a request and need to be approved by the other contract partner first. Since Germany and UK are both within EU, law may be quite equal. I think this is a pretty fair rule.