Chinese citizen will be allowed to deal with up to US$50,000. Does that mean a couple can do $100,000? If that is the case, they can wire transfer the proceeds though bank of China to its london division. A routing number and/or SWIFT are needed. They need to have an account with the division or if you have an a/c there and they trust you as much as I trust you.
Thanks much for giving everyone a chance to show kindness.