Should we have a queue for whites and one for the darker skinned visitor? Or should an Australian passport give you free entitlement to the fast track queue?
I suggest a separate immigration line for those of us from low risk countries such as USA, Canada, AUS/NZ, Japan, Singapore etc. This line could be fast tracked as it would require minimum screening. Keep the current "Others" queue for those who need to explain how they paid for their ticket to get to the UK and what reasons they have for wanting to return to their own country.
There is talk about certain countries linking up passport control so that a Singaporean visiting Australia for example, could use the automatic lanes currently limited to Australian passport holders. Obviously this would be limited to countries with low overstay/problem rates and where the integrity of the passport system wasn't in doubt.
At least in the 1980s immigration officers were polite and well mannered when dealing with visitors.
I think you will find that Australia has a greater problem with illegal immigrants from the UK than vice versa.