Reply To: Sydney Return Trip

[Whisper2]

Maybe you could buy 20k more Avios using Avios boost (if you have managed to collect 5k in the last 30 days) or transfer some Amex points to get to 340k total which you need for the peak return on the 241. Then book child + yourself on the 241 and pay cash for 2nd adult.
If you can get more Avios then you can use the BUV for adult 2.