The public service are un-elected, largely unaccountable, very expensive and wield a tremendous amount of power.
Westminster type systems are arguably hybrid oligarchies. Australia is a good example - look how it continues to function in largely the same way, on largely the same trajectory, despite having 5 prime ministers in the last 10 years.
What do you mean? The PM is a function of what the governing party wants, and in 10 years we've mostly only had a single party in Federal government. But either way, this isn't really true of state governments which have differed quite a lot over the past few years.
Westminster type systems are arguably hybrid oligarchies. Australia is a good example - look how it continues to function in largely the same way, on largely the same trajectory, despite having 5 prime ministers in the last 10 years.