Vietnam Business - XMAS - LGW-MEL £1685 incl. all taxes
Found this on Vietnam Airways:
17-DEC LGW - MEL (note: 14 hours in Ho Chi Minh City)
06-JAN MEL - LGW (note: 8 hours in Ho Chi Minh City)
Return price - £1,685 - Very good for Christmas Business Class - UK-OZ