I have replied to the ticket you raised.
You only ordered these stickers on the 2nd January, at 18:46PM.
Thats around 8 working hours before you opened this thread, and raised the ticket. I don't think even superman could produce and deliver them that fast! Especially where Royal Mail is involved.
Please give some time for delivery, and even a little bit longer so close to the busy Christmas period. As akyakapotter says our sticker maker has been away, so please give some time for him to catch up and get these dispatched to you.
They will be with you as soon as possible!