Originally Posted by
User_4444
Thanks for the welcome and information.
I just tried a false booking going First and out of 14 seats, 4 had gone, does that mean 10 are available for buying with cash and Avios? Or do I look another way?
No, looking at available seats was not what was suggested. You need to log into your account and look at redeeming avios for a reward in F LHR-YYZ. If avios reward seats are available in First then you can call in and upgrade using avios (UuA).