City of China will probably be the name of a place that makes the stuff. Unfortunately I can think of more than one possibility - Limoges and Meissen are two that immediately spring to mind
Many thanks to both. I see Bucharest now. I had thought along similar lines for no.2 but couldn't find any way of deciding which city it should be, so felt I was on the wrong track. I had thought of rhyming slang - china (plate) = mate, but that didn't seem to lead anywhere.