When flying long distances to Australia or New Zealand from London via Singapore book a flight which has a long layover time between flights and book yourself into one of the three Transit hotels. Each terminus has one, no need to go through immigration or customs just get off the plane and check in to your quiet hotel room. Brilliant and cheaper than flying business class.
Updates
I agree that the Singapore Airport Transit hotels are perfect for painless long distance travel to or from Australia to Europe. No need to suffer overnight in economy class, when you can stay for 9 hours or so, in comfort airside in the terminal, a few minutes from the gate. Have a shower in the morning, breakfast and continue your flight. No jetlag. I did this MEL-LHR recently.
Is this your business?