Can i exit PVG airport visa-free?

Hi,

I depart Seoul ICN and arrive into Shanghai PVG at 16:40 and then depart PVG back to London at 12:30 next day (stopover 19h 50m). Do i need one to exit the airport and go around the Bund? What type do i need? Is this free? Do i need to pickup my lugguage once i land in PVG? Is there lugguage storage services/lockers in PVG airport?

I hold a British/UK passport.

A few questions but your help would be much appreciated.

Thanks