To be honest, the anti-immigration right hold up Australia as a model for an immigration system as a rhetorical tool rather than an explicit model because (i) it's a prosperous liberal democratic country that can't be glibly dismissed and (ii) there's widespread public perception that it's unusually hostile to the idea of accepting immigrants and doesn't let many in.
Of course the reality is that Australia lets in far more migrants per capita than the UK, but that's certainly not the objective. There are people on the anti-immigration right that want to see more skills discrimination in visa awards but are quite happy with the overall numbers arriving every year and are entirely comfortable with the idea of a large percentage of the UK population being born overseas, but they're definitely a minority.
Of course the reality is that Australia lets in far more migrants per capita than the UK, but that's certainly not the objective. There are people on the anti-immigration right that want to see more skills discrimination in visa awards but are quite happy with the overall numbers arriving every year and are entirely comfortable with the idea of a large percentage of the UK population being born overseas, but they're definitely a minority.