Newbie question so bare with: I'm looking at YVR-LHR with companion fare next year and can find YVR-LHR(LGW)-MAN that is cheaper in terms of additional charges than the straight YVR-LHR. However, I'd need to switch airports in London. meanwhile searching on Qantas I can see flights arriving and leaving from LHR the same day, but I can't seem to get these combos on BA.com? Why? Can I call this in? Interestingly, I also found cheaper YVR-LHR-MAD, but last leg on IB so suspect this wouldn't work with the companion redemption, correct?