Originally Posted by
Aztec_Flyer
I think that by booking it as two one ways you can solve your problem.
E.g. If you want to stop in LAX on the way out then book LHR-LAX and then LAX-YVR-LHR with YVR as your "stopover".
If you want it on the way back then book LHR-YVR-LAX with your "stopover" in YVR.
Thanks for the advice, but the problem was that the call centre said that YVR or LAX were invalid stopovers as it wasn't really on the way, based on the fact that there is a direct flight available.
Jon