Mr. Emre Eler, UK passport holder

Mr. Eler will fly from London to Hong Kong Sun 16th Oct landing at 13:30 local time on Monday 17th. He will then fly from Hong Kong to Beijing Capital on Wed 19th Oct landing at 20:00 local time. Mr. Eler will depart Beijing on Fri 22nd Oct at 11:00am local time and is scheduled to fly back to London.

Please confirm if this is within the 72 hour transit visa guidelines or if Mr. Eler will need to fly onto another country before returning to the UK?

Thank you in advance