Ahem.... (from http://en.m.wikipedia.org/wiki/Doctor_(title))
"[In the UK, "Registered medical practitioners" hold the degree of Bachelor of Medicine (usually also with surgery). Though they are holders of bachelor-level degrees, history has allowed the use of the title doctor by physicians, however, it is recognised that it is in essence an honorary or courtesy title. ..... Australia and New Zealand use the titles of Mr and Doctor, in the same way as the United Kingdom."
Edited by Pingson - 8/1/14 at 4:00am