Is it possible to apply for a Chinese visa in China?

Hi I am in China at the moment and have used up my single entry one. I am going to Thailand then flying into Hong Kong but I have to go back into China to get a flight back to UK from Guangzhou a few days later. SO Can I apply for another one while in China? How do I do this? OR Do I have to wait to get to Hong Kong and then get a L type there? OR is there a special case in which I can travel straight from Hong Kong to Guangzhou airport without having to get a visa? The first option is best for me. Any help is really appreciated. I would prefer the first option.