....not the case if you have one of the following as stated in self certification form here :-
https://www.raa.asn.au/wp-content/uploads/2012/02/Recreational-Aviation-Australia-Medical-Declaration-Revised-November-2014.pdf
Includes mental illness (medicated or otherwise), and diabetes, which I have, so I have to get my GP to write a letter every year saying it is under control and I am fit to hold a driver's licence. So presumably the same applies to you, BAz, if your GP will sign you off.
Cheers,
Neil