we got the grant in 88 Lizzie. it was about 1600 up front and the balance paid in decreasing amounts monthly for the next few years. I think it actually ended in about 1990 before the next reincarnation in 2000. It wasn't called FHOG though, had some other dorky name and not advertised the way things are now.
maybe that's what it was - as i 19 year old i didn't really take much interest but thought it was called something like "stamp duty (something)". those were the days when one spent their entire lunchtime standing in the bank queue waiting to put a cheque into the mortgage account.