The Minister of War & Finance has decreed that we are going to Europe in May/June 2018.
Sydney > Athens via Scoot in May at ~$500 each seems like a good deal, so we're planning to start in Greece and finish in the UK.
It looks like London > Sydney flights in June are ~$800 each.
Should I book now or wait for a deal?
I travelled to the UK in April/May this year and I booked my flight and most of my hotels in November 2016. As long as you book about 6 months in advance, you should be fine.
I've booked 1 way to London just under 600 looking fora return from moscow or Athens (wont fly scoot no check in)
I' booked London return departing may for $1300 in march of the same year with royal Brunei.
BOOK NOW!!! DO IT!! DO IT NOW!!!
Seriously - prices aren't going to get much cheaper than that. Just ensure you know the cancellation policy of the flights and that you're cool with that. Make sure you have everything else as well planned out and flexible in case something changes between now and then. Book it, live it, love it.