Answered by ZUPAN
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Sep. 03, 2019 06:21
Actually, the rules with the luggage depend entirely upon the carriage policy of the airline. In reality, I can assume that since you are flying on a single (through) ticket provided by Air China, your luggage will be checked all the way from London to Bangkok and in the same way from Bangkok to London on your return leg. You will know this detail upon your check-in in London or by contacting the airline directly.
Also, you will declare at check-in in London that you will travel to Bangkok via Shanghai using 24 hour visa free transit. The same thing for your return leg from Bangkok to London.
In order to be allowed to exit the airport, you will apply for 24 hour free entry permit upon your landing in Shanghai. Having 18 hours of layover means that you will want to exit the airport, explore the city and also to have a good sleep in the proper accommodation. For this reason, you will book your accommodation before your arrival in Shanghai and will also present the authorities with the accommodation confirmation in hard copy. Your chances to be allowed to exit the airport are very good and with a accommodation booking confirmation, practically certain.