I'm all for a model whereby the child will be told by the health department upon reaching maturity (making the parents tell their child from an earlier age) and that the evidence is even recorded on the birth certificate so that there is no hiding it.
I agree with you there. Even with the VIC ART 2008 legislation & donor conceived being noted on a birth certificate, these people still think they will be able to hide it.
It's an Australian forum Quinny. Essentially run by a well known media organisation.

Google donor sperm buddy group & it will be obvious.