Visa free transit from Bali, Indonesia to London with stopovers

Yes, your itinerary is perfectly within the 24 hour time frame and is covered by 24 hour visa free transit. Simply speaking, you do not need any kind of visa.

You are advised to print out your flight tickets and to have them at hand. Upon your landing in Guangzhou you will immediately approach transit counter where you will apply for a temporary entry permit to be allowed to cross the immigration because your following flight will be a domestic one to Zhengzhou. At the counter you will present your tickets as wells as your passport and you will proceed toward your next flight. This application is free of charge and just a formality. Also, when you get arrival/departure card on board of plane flying to Guangzhou, you will fill it out and tick a purpose of your visit to China - transit. You are good to go.