Italy -> Shanghai -> Tokyo then Hong Kong -> Beijing -> London

I am a UK citizen flying on an Asia tour.

Flights

Italy -> Shanghai (56 hours) -> Tokyo
then
Hong Kong -> Beijing (70 hours) -> London

Hi, flying from Italy, I am staying in Shanghai for 56 hours, then depart to Tokyo

on the return leg of my journey 2 weeks later, I am flying from Hong Kong to Beijing staying for 70 hours, then depart to London.

Will I get a free transit or will I have to get a double entry G?

I appreciate your help in advance.