Hi Lisa,
Cando is probably the best one to help you in this, I can see your father on the electoral roll in 1977 but not after that.
Possibly finding his parents deaths if they are deceased may give you a clue as to where he is.
The other possiblity is contacting people via Facebook, I see that there is a younger man on facebook who shares the same name as your father, the only information is that he graduated in 1979. Perhaps you already know each other, or I guess it is possible that your father had other family.
mum mum