Answered by Borut | Oct. 17, 2024 23:24
If your entire transit time, counting from your first scheduled arrival in China until your last scheduled departure from China is shorter than 24 hours, you will be definitely and undeniably eligible for 24 hour visa free transit and you do not need any kind of visa. You will just declare at check in in London that you fly from London to Singapore via China using 24 hour visa free transit scheme.
As far as the temporary entry permit is concerned, the first thing you have to be aware is the fact that the issuing of that permit id definitely not a passengers' right. Your right is to travel through China visa free based on 24 hour visa free transit, but not to exit the airport. The permits are offered to those with long layovers, families traveling with small children, disabled persons... In any case, even then, this is just a bonus offered by the Chinese airport authorities based on discretionary decision.
In any case, you are advised to try to obtain a permit. The first thing you will do upon your landing in China will be to approach 24/144 hour visa free transit counter where you will apply for a temporary entry permit. Here you will basically present your flight itinerary and possibly a hotel booking if your layover is during the night. This application is free of any charge. After a short check a decision whether to grant you a permit will be brought and if successful, you will proceed to the immigration and to the city to spend your layover time on your own. Have a nice journey.