Hiya I have have neva seen my dad and would like to his name is martyn duffy lived in nottingham when he waz little and think he does now

That unusual spelling of Martyn should help.
As does that fact that you still think he's in Nottingham.
Start with the phonebook, Facebook, and asking around the area where you were born, relatives and neighbors.
It would help to have his age?

Charlotte, what is his age - and yours?