Hello Frances
Do you have Edward's marr cert there? What are the names of the two witnesses,as quite often they turn out to be older brothers and sisters.
I have found quite a few of mine like that(costs one extra birth cert -but so what!)
Have you also considered the possiblility that his parents never actually did register his birth.I'm sure we all have one of those who we will never actually be able to find.
Just a couple of suggestions.
Carol