Hi,
I am flying tomorrow from London(LHR) to Bangkok(BKK) via Shanghai(PVG).
First leg is with British Airways from London to Shanghai Terminal 2. Then I have 3 hours in Pudong (if everything goes to plan) and continue to Bangkok with China Eastern Airlines (from Terminal 1). I will travel with hand luggage only. It doesn't seem to be possible to check-in with China Eastern over the internet or phone.
Does anyone know the transfer procedure in Shanghai? Do I need to go through immigration?

Many thanks in advance

Phillip