Quote from the ad:
"We are delighted to bring you our latest promotion!
Better pack your bags it’s time to fly to London from as low as AUD999*.
Grab our exclusive fares now as promotion is valid from 10 May to 23 May 2016 and for travels from 10 May to 31 August 2016.
Valid for sale until 23 May 2016
*Fares are inclusive of taxes and surcharge, may not be available on peak days or on all flights. Subject to seat availability. Conditions apply."