Originally Posted by
MSPeconomist
I think most of us here have been saying that even three hours may not be enough. There are ATC delays at PEK and there can be long immigration lines in HKG. Are you prepared to pay a walk-up fare for HKG-LHR?
The OP will not need to deal with HK immigration. Furthermore, I've been doing quite a bit of PEK-HKG recently, and find that delays >60 minutes are not especially common.