Finally made our return flights; we are flying 5 July Virgin Atlantic LHR - LAX and then DL LAX - AUS; was able to get it for 75K per person upper class. Although not available on frequent flyer tickets, I was entertained by Virgin's Limobike transfers to Heathrow.

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Limobike, a speedy motorcycle transfer that helps you avoid the London traffic. Full protective and wet weather clothing is provided. The protective helmet lets you speak to the driver and make phone calls. Your Limobike will take you straight to the Upper Class Wing, where our team will take care of the rest.