Originally Posted by
sschwenk
But a cash upgrade from WT+ to CW would get you TP/Avios for CW? Seems slightly unfair...

Agree, they should really give you pro-rata TP and Avios for the CW->F cash upgrade part.
I would imagine the ideal situation is if the miles+TP don't post for the flight then you enter in the number on the F boarding pass on the website and get the F miles+TP.
Would be interesting to see if one could have the FF number removed from the ticket by an angel at the CCR and try this method out