As I have Italian Passport, I understand that I will be able to use the 72 hour visa, right?

I am flying Shanghai for 2 days in December, departing from London. Also, I would like to go to Japan, The Philippines - Layover of 3.35hs in Shanghai PVG - and come back to the UK - Layover of 4.15 hs in Shanghai PVG.

If so, I wonder if I can apply in advance in London or the only way is to apply at the Chinese airport?

Thanks,

Franco