Hi Marion
I have just returned from the latest China tour
Take about £40 in Yeun for immediate use.
They are soon to stop taking travelers cheques altogether and many have already stopped taking them.
Take sterling, but make sure it is clean, undamaged notes
You will find it very easy to exchange at hotels and banks and the rate in China is better than here.
ATM machines in Bank of China branches will also accept your debit card, so you can easily draw cash, but only in the banks that are part of the Bank of China group and not other chinese banks. Don't forget to inform your bank and credit card company that you are going to China, or they may block transactions
You will really like this holiday, and if purchasing from traders, do not be worried about offering one third of what thsy want for the goods, as you can then have a good barter with them and get some good deals