Sorry for this long delay answering you :-(

"Sir F.A. Rien" :

Haunt eBay and don't be afraid to contact the seller and make an offer
on a 'buy it now' listing. I've managed some early mint GB that way.

Thanks for the trick !

You should find a copy of Brusden-White if you are going to study OZ
in detail. They're the Yvert specialised of OZ.

Yes I know the reputation of the Brusden-White.
I have seen that the set of 9 volumes is at 645 AUS $ plus postage
http://www.brusden-white.com.au/
I am not sure I will ever be able to buy them

You'll also need access to a 'black light' for the few issues
in ordinary and 'phosphor' coated.


I imagine you are speaking of the 'helecon paper' stamps
Yes I have already two UV lamps, for each of the wavelengths
used by the different countries.

--
All the best,
Pierre Courtiade