Does anyone know if there are ATM machines at Yantai International Airport please?
Yes there is.
Just use your UK card as normal, with your 4 digit pin.
As a rule, you will be invited to enter a 6 digit pin, as all Chinese bank cards are 6 digit pins.
But UK works oK with just the 4.
You will find ATM's everywhere in China. I use my British cards frequently without any problems. Do inform your bank/building society before travelling over though.