It's not unusual for there to be a £10 difference between dollar and yuan exchanges. The table from tradeblock compares the prices of bitcoin across the largest exchanges, and all the yuan exchanges are $10 higher today. I have seen $40 to $50 differences before today, and a $10 is on the low side of the average difference.

https://tradeblock.com/markets/bfnx/xbt-usd/30m/