Yes CW I fares on BA out of Toronto are insanely high this fall. YYZ-LHR-YYZ is close to CAD$6900 while in the opposite direction on the same dates CW is $4610 for CW and an A fare is only $5400 return. As c-w-s suggested burning Avios one way to start all trips from the U.K. is an option but there is still the BA Holidays Flight and car option to LHR for $4948