Amazon UK has explained that they plan to have Nintendo Classic Mini pre-orders fulfilled by the middle of December. The system has been in and out of stock at the retailer for quite some time, but if you pre-ordered one late then you should be able to get yours in time for Christmas. Those of you who pre-ordered early will get yours on release day.
Due to limited stock we are only able to offer one unit per customer per address. You will be notified via email of the expected delivery date closer to the time. We will be fulfilling customer orders in the order in which they were placed, and expect to fill all pre-orders by mid-December 2016.