China Post is not available in London. If a package is sent from China to London, it will be handed over to Royal Mail to deliver when it's in London. If you use Royal Mail to sent a package to China, it will be delivered by China Post when it arrives in China.
I was waiting for my courier over the past few weeks and when I checked the status of my courier today, I found that it is in the collection point and the recipient has to collect it by presenting an original ID, in this case it's me. But I don't have the information about the collection point, where it is located, which service it belongs to, and etc...Here is the details of my parcel ID 344136 shipped by china post LZ142327620CN
China China Post United Kingdom Royal Mail Destination - Tracking consuming: 602 ms Origin - Cached time: 2020-07-06 13:29:57 (GMT+01:00) 2020-07-03 23:29 GB, mail in domestic transshipment
2020-07-03 13:29 LONDON, customs processing, please contact LONDON for details
2020-07-03 12:29 LONDON, customs processing, please contact LONDON for details
2020-07-03 07:29 LONDON, GET TO LONDON
2020-07-02 20:44 LONDON, mail has been cleared and sent to the airport
2020-07-01 15:40 LONDON, GET TO LONDON
2020-06-30 10:05 Shenzhen, China, leaving Shenzhen, China
2020-06-30 06:13 Shenzhen, China, Arriving in Shenzhen, China
2020-06-29 22:44 Guangzhou City, leaving the "Provincial International Mei Garden Business Department", the next stop "Shenzhen Post Expre
China Post is not available in London. If a package is sent from China to London, it will be handed over to Royal Mail to deliver when it's in London. If you use Royal Mail to sent a package to China, it will be delivered by China Post when it arrives in China.