Expert System - Australian Flags by McGoo Software

Based on the responses you have made:

The flag is most probably the state flag of New South Wales

Conclusion Notes:

The flag of New South Wales is a British Blue Ensign defaced with the state badge. The badge depicts the cross of St George in red on a white disc. At the extremity of each arm of the cross is an eight pointed gold star, and in the centre of the cross is a golden lion passant guardant. The flag was adopted in response to British Admiralty criticisms that the previous flag was too similar to that of Victoria. The state badge of New South Wales was designed by James Barnet, the Colonial Architect, and Captain Francis Hixson, retired of the Royal Navy who was president of the Marine Board. No meaning of the design was given when it was submitted to London for approval, although it may have been a simplified version of what was then the semi-official arms of NSW. Historical Flags

Expert System Rule:

IF on the flag the Southern Cross is not visible
AND on the flag there is a Union Jack present
AND the symbol on the fly of the flag looks like a cross
AND the colour of the cross is red
THEN the flag is most probably the state flag of New South Wales.

Calculated Certainty Factor: 0.71 = most probably