Originally Posted by Globaliser

FWIW, I've recently GUFd an AMS-LHR-HKG//SYD-LHR-TXL from ET/WT+ to CE/CW on the phone with no difficulty. Rather comfortingly, this was simple enough that it didn't even need to go to fares: the total cost was exactly what I'd already worked out. The agent and I had a quick chat about how the change has rather transformed the way in which GUFs can be used; she was fully aware of what to do, although not yet well practised in doing it.