have to buy foreign currency first to send it. everbright bank and postal savings usually handle western union , probably more in shanghai, the document is small print , bear down so it goes through the carbon, use capital letters for everything or they will type something wrong and you have to start over. i would imagine the blackmarket in front or the bank or  inside hsbc can get british pounds for you.

I have used b4 to send wampum to an Ola.  it was down in SZ @ an ABC that I did this.  They insisted on fresh, clean USA $;  20,50,or 100's. no marks on the bills (careful be,,,, because many banks/money-changers mark on bills).

Passport, and fill out the form very carefully.

Transfer status can be tracked online.  The recipient will need ID & the MTCN. Fee was reasonable,,,  15 US if I recall correctly.

Hey there. You can only send $500 a day. Go to a China everbright. Bring all your documents and passports. Try to find one where there's a person who speaks english cause it makes it much easier. 

you can send up to 2000 but the bank will only convert 500 a day of currency , so go to the bank to convert for 4 days or buy dollars on blackmarket outside.i never convert at banks, my school has a reputable money man that takes care of all the teachers and gives us a better rate than the bank.