Ever being the sort of person to jump right in and sort out a problem (or make it worse, *snigger*).
I dropped them a quick line suggesting they look again...
Their reply came back quite quickly:
"Sir, these cups are designed with great detail and attention, the Marborough shape, the lovely portraits and the ornate gold detailing on the rim and drinking handle, for the most lovely wedding in all the centuries.
We look forward to your orders. Cups to your region are delivered early April in time for the beautiful day.
Good evening and luck to you.
I don't think these will be sent out once the Chinese Embasy political section spots the error in case there's some huge loss of face. They'll order the whole lot withdrawn, and maybe even someone will get their head chopped off.