Hi ! Dear sir / Madam, I am afghan British national, currently i live Kabul Afghanistan

The required documents include your passport and copy of its data page, the completed application form affixed with a passport-style photo, your residence permit in Afghanistan, round trip air tickets and hotel reservation, as well as other documents the consular officers consider necessary. And then submit your application to the embassy of PRC to apply for it.

Or you hold both Afghanistan and Britain passports? If yes, because you are in Afghanistan currently, you can only apply for a group tourist L type with your Afghanistan passport, but I’m afraid you need to book a tour and then ask the travel agency to apply for a group tourist L type for you.