I snapped this up straight away when I saw it a few days ago. It fitted in with my existing bookings to LHR for
August, at a cost $1,735.
As I was going be in Hong Kong at the start and end of this trip, it wasn't overly expensive to get to and from CGK. And I was able to cancel three award bookings in business class to offset the cost of the QR ticket, HKG-KTM (avios), KTM-LHR (UA miles) and FCO-HKG (QF points).
I only had to arrange a new ticket from MXP to LHR, which I did using avios, MXP-MAN and a Virgin train to London, as I didn't want to wait several more hours for a direct flight to LHR.
So it was an amazing fare and worked out very well. Note that the current fare SYD-MXP-SYD on QR for my dates is $7,187, so it is a worthwhile saving even if buying business class SYD-CGK.