Thank you everyone for taking the time to reply. My apologies for not being clear in my initial post about which London I was referring to but you guys guessed correctly that I was talking about London, UK (LHR).

I tried pricing the legs individually, but the costs went up significantly. I will try the website that "skofz" referenced earlier and see where that gets me. It's too bad that no discounts are available for multi-city bookings, but oh well what are you gonna do...

Good to know that it looks like we'll have enough time to make the transfer in Vancouver. A quick thought just occurred to me though as that has to do with our luggage. Will we have to claim our bags and recheck them after we clear customs or will those be checked straight through? I'm assuming no, but figured I'd ask anyhow...

Thanks again everyone, you've been most helpful!