You are a citizen by birth in Australia and a ciitizen of UK by blood.
contact the embassy.
People born in Australia on or after 20 August 1986 become Australian citizens by birth if at least one parent is an Australian citizen or a permanent resident at the time of the personâ€™s birth,
A child born in Australia to parents who are not permanent residents or Australian citizens acquires Australian citizenship automatically on his or her 10th birthday provided the child is ordinarily resident in Australia. Children born in Australia to foreign diplomats do not acquire Australian citizenship
People born in Australia before 20 August 1986 became Australian citizens by birth unless one parent was entitled to diplomatic privileges and immunities or was a consular officer of a foreign country.