Its only a mute point but if you are a tourist coming from Australia you will soon be spending the best part of £100 (APD) simply to fly home.... in that time you will have no doubt bought the odd meal, travelled around the UK , stayed in hotels etc etc
In short you will have made a contribution to the UK economy !
Contrast this to19M transit passengers or as I describe them freeloaders, who fly in ,then fly off into Europe, who do not pay any APD, infact we are lucky if they buy so much as a burger as they dash to their connection !
.....and if that wasnt bad enough we are now going to buy them another bloody runway! jeez !