British Citizens require a visa to visit china and we recommend you contact https://thetravelvisacompany.co.uk who will make your application as smooth as possible.
With effect from 1 November 2018, all visa applicants aged between 14 and 70 inclusive will need to make their visa application in person at a Visa Application Centre. As part of the application process, biometric data (scanned fingerprints) will now have to be provided.
Biometric data may be checked/collected by the Immigration Authorities when entering China to register your entry to the country.
If you’re transiting China, visa waivers are available in certain places. Visitors transiting through Shanghai can apply online for a 144 hour visa exemption via the Shanghai General Station of Immigration Inspection. In other visa waiver transit locations, applications must be made in person on arrival. Contact the Chinese Embassy or the China Visa Application Service Centre before your proposed trip for further information. You can also consult your airline/tour operator about visa requirements.
If you visit Hong Kong from the mainland of China and wish to return to the mainland, you’ll need a visa that allows you to make a second entry into China.
It is your responsibility to check your visa details carefully. Don’t overstay your visa or work illegally. The authorities conduct regular checks and you may be fined, detained or deported (or all three).
If you remain in China longer than 6 months, you may need to get a Residence Permit.
(Information provided by gov.uk)