I know it's been a while since this thread had any activity, but as I was googling for some info on FNH and came across this site I thought I'd give you a little input.
I was born there in December 1955, my sister was born there a few years earlier.
I was in Chesterfield last week and thought I'd show my wife the place where I made my entrance into this world, so I drove down Saltergate and found Fairfield Road but alas, no FNH. Not totally unsurprising but a little disappointing nonetheless.
My stay there was longer than normal in that I was there for two weeks, but don't know what the complication was but that was where I spent my first Christmas... my sister hated me from day one for taking her Mum away at Christmas!

All is well now though.