Perhaps 'people like me' should invest £70/year in the Registered Traveller Scheme to avoid the 'smellies'. I think there's a box on the application form where you can add 'Reason for Application - Sense of Entitlement'
The first thing I did was pick up that leaflet after the nosey cow had finished, unfortunately you need to be making 4+ visits a year to qualify and I'm only making one or two.
Seriously a middle aged Australian couple of the paler shade aren't a high risk for immigration anywhere. The "in your face" attitude of the British immigration officials of West African origin doesn't go down too well. The UK has a serious immigration problem from the third world and Eastern Europe, not the antipodes and some staff training in the area of who needs extra attention would not go amiss.
Australian immigration officials are generally courteous but as in any country you can usually find one who's having an off day. US immigration are a different matter.