Have you been charged right now?
The account I've got linked to my order doesn't show pending transactions but my available balance and total balance are about £350 different, so that would account for the watch plus the breakfast i bought on the way to work! I'm pretty sure I've not spent £340 on anything else today...
I'm not sure how long it takes my bank to show transactions but if it's not updated by this evening and the shipping status hasn't changed I may call the bank to find out what it is.