How do I redeem Sydney-London(LHR) with Cathay Pacific using Qantas Points?

How do I Book a flight Sydney-London Return using Qantas Points but flying Cathay Business Class Through Hong Kong?

Anyone that can help with exactly where you go to make such a booking using Qantas FF points would be very appreciated.

when you choose Sydney to London in a rewards search it will give you available options of what is available for all one world and emirates (although I think Malaysian and JAL don’t come up, you have to call), if a routing on Cathay is available it will show up

You can book on the Qantas website using the multi stop option, insert first leg SYD-HKG and the second leg HKG-LHR. Also select show reward flights then you will see the Cathay Pacific flights.