Originally Posted by
Globaliser
If I've read it right, the OP is asking about the other direction: LHR-HKG-USM. Through-checking or not will be at the discretion of BA at LHR - and we all know what stated policy is.
Sorry, you are quite right, BA25 departs LHR so I mis-read. So you are quite right, there is no way this can be done without re-checking luggage in HKG, though it would be different in the return. The only way this can work from a LHR start is by having it on a single ticket.