Step right this way for another bit of Cockney rhyming slang.
If you've ever seen your actual bona fide East End market stall (not the ones in Eastenders that sell fruit, flowers, CDs and occasionally clothes when they remember to stock it and who's running it) you may have seen a stall with a bit of crockery and a nice chap at the back stamping "China" on the bottom of them, as he sells you a genuine authentic piece of replica Wedgewood and hands it to you in a carrier bag that probably won't make it all the way home and you'll have to go back and get another one, he may say
"There you go me old china"
He isn't actually referring to the China but he is using a piece of Cockney rhyming slang for the word "mate", yes, China = China plate = mate.
Here is a piece of China with a couple of very close Chinas on