Thanks Guy,

Is there anything specific I need to ask for or a certain phone number/channel to use in Australia? I forgot to mention previously that the SQ call centre through the general reservation number said upgrading with a mixed fare type is possible, but the dedicated Krisflyer Gold number said both flights need to be Flexi.

Can you book the fare over the phone and then upgrade online to get the 15% discount, or do you have to upgrade over the phone too?

Thanks!