Hats off to you spark!
I think an extra word is required between Johnny and Stead, or before the Johnny.
There's definitely work needing done, but the tune is great, and the last line is about right. How about -
He scores when we're playing at home,
He always scores with his head,
He scored another goal about an hour ago,
And there's only one Jon Stead!
Version 3:
Show us the way to score goals,
Score them with your feet and with your head.
We know you're gonna score another couple of goals,
Cos your name is Jonny Stead!
version 4:
He shows us the way to score goals,
Scores with his feet and his head,
He scored a little goal about an hour ago,
and his name is Jonny Stead!
We should get people singing that in the Blackburn end