“I am travelling on Qantas from London Heathrow terminal 3. Which is the best lounge?” This question appears almost every other day on Facebook, so here’s what I believe is the definitive answer, in order, for a OneWorld frequent flyer, based on exhaustive testing. I’m assuming that you’re flying QF2, which goes all the way to Sydney via Singapore. (Or on QF2 to Brisbane or Melbourne, changing in Singapore). The first tip is that if you’re QF Platinum, you can use the Fast Track l...