China
This is exactly the sort of thing I like bringing back from China: small enough to fit in a bag, but specific enough to remind you where you bought it. The best version is usually the sealed jar, tin or packet from a normal supermarket, spice stall or food hall, not the most expensive tourist version. It is also the kind of thing you can talk about when someone asks what you brought back, because there is usually a little story attached to where you found it.
China
I would put Jasmine green tea on the list for China because it is the kind of thing that feels useful once you are home, not just another airport purchase. It is a good one because people can try it slowly at home, and it makes a nicer gift than a mug with a place name printed on it. The reason it works is that it gives you a quick reminder of the trip without needing to keep a fragile ornament safe forever.
China
When I think of an easy, crowd-pleasing thing to bring back from China, silk scarf is a good pick because it does not need much explanation when you hand it over. I would avoid the obvious tourist print and look for something with a local pattern, fabric or cut that still works with normal clothes back in the UK. I would rate it higher when it is locally made, clearly labelled and easy to use at home, and lower when it is just tourist packaging.
China
Mooncake gift box is worth adding because it feels like something you actually noticed while travelling through China, rather than a generic souvenir. Look for a boxed version with a decent date on it, especially if you are buying it near the start of the trip rather than at the airport. The ideal version is modestly priced, not too bulky, and good enough that you would buy it again even without the holiday memory.