Originally Posted by
dood125
I might try and upgrade to Club one way using avios on YYC-LHR.
Will that earn mean more tier points? despite it being originally booked WTP inbound?
No, you will earn as per the underlying cash fare (WTP). If you paid to upgrade to CW you would earn CW TP's (140 for YYC-LHR).
You could take a less direct route or look at ex-EU CW fares.