Below are good websites with plenty of real legal advice, particularly the first one set up by Sean Hardy, a Barrister in Victoria. If you do settle in, and spend some time reading through them you will realise that the odds are stacked against the motorist. The more you read, the greater angst you will no doubt get over road law and radar policy transparency. Some of the threads give very good advice on what to say......or not to say when involved with situations involving the Police. Might be worth posting your red light camera circumstance to get some clarification. Keep an eye out for Sabre in the post's, suspected of being a TMU operative!
http://www.trafficlaw.com.au/forum/
http://www.fightfines.info/forums/index.php