According to out friends at MI6, night filming took place at Ascot last week, which is doubling for Shanghai International Airport. According to the article on MI6:
Filming has been taking place at after dark for scenes set at night, presumably to help hide the racetrack outside.
It is not clear if the image of the clapper released via the official 007 Facebook page on Friday was at Ascot, although it does feature some Chinese characters on the signage to the left of the image.
