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I have many old friends and colleagues that I have lost contact with over the years since I left Sydney (we did not have e-mails when I left and relied upon snail mail).
For starters, can anyone check the telephone directory and advise if there is a M Cerreto listed (not too common a surname)?

You could try the online whitpages. whitepages.com.au - Search for an Australian Business, Government or Person

Mike,
Many thanks for the thread - I've found the one I was looking for!