It was not stuck, I already had cut exactly same dies with same cardstock and same plates.
Email was sent to Sizzix UK on Sunday, they replied today (Tuesday) and asked me to contact the seller company, which I did. Waiting for their reply now. I have NEVER heard anything like this before.Less than a year and my heart is broken now.
edit #1 * Wednesday 23rd MarchSo far so good: I got a phone call UK time about 12 noon, and lady on the phone rang to arrange collection and then replacement. :) Company is hugely popular and I believe one of the leading craft suppliers.
I'll keep you informed :) One problem: my plates and the very newest die are stuck in the middle of the machine.