Originally Posted by
MattUK81
however I could upgrade both the outward legs (to Heathrow and Heathrow-Zurich), which I found a touch strange. Apparently the 1 seat turns into 2 when you do that.
Availability does change depending on the origin of the flight, so starting somewhere differently from Heathrow may indeed find some hidden seats. Another oddity that keeps Flyertalk a useful tutor!