Hi Wiggy,
Try Classic and Historic Automobile Club of Australia (Sydney) Inc.
I joined several months ago via the recommendation of a good friend.
Located primarily around Glossodia, Pitt Town and Orchard Hills NSW.
Any make and model historic vehicle welcome.
Historic regos. No huge requirements.
Great friendly people. And best of all no politics.
Good to get away from the same old, same old model cars and see a huge variety of vehicles.
They are very professional. And they do have a website too!