Originally Posted by
Paralytic
This limitation has been pointed out on this board before, but its good to highlight it again to remind people to check with their TA before booking as to whether it will be upgradeable with Avios.
This is fine if your TA is a person(!) but if you buy tickets from an OTA you're not usually in a position to clarify this kind of thing, at least not quickly, in my experience.
Some would say one of the main benefits of buying tickets from OTA is
not having to phone them (on an 0870 number...) during the transaction
