5* Hotel 9 min taxi (Approx 10AUD) from MCG, 26-30th Dec, 403GBP per room (201.50GBP each)
5* Hotel 6 min taxi (Approx 10AUD) from SCG, 4-8th Jan, 561GBP per room (280.50GBP each)
Flights: LHR - MEL - SYD - LHR = 600GBP (Flights booked a week apart in Nov 17 as Dec flights not available to book yet.)
So, to get there and stay, call it 1100GBP each.
For what is a 5* two week holiday on the other side of the globe, that is bloody reasonable!