Many thanks, Bryant, Jennifer and Carol.
Bryant - Douglas Wood is my friend's grandfather and he died in 1958 - making his birth year about 1895. There are a few men of that name born in that year, but I have nothing to say what his father's name was so I wouldn't know which one was him if I bought the certificates. Hence, the no marriage situation being really annoying.
Jennifer has the right birth information, he was born in Marylebone at the Queen Charlottes Hospital. I think their records are at the LMA and am keeping that option on a back burner as I'm not certain that they would actually hold anything that would help us.
Carol - It would be greatly appreciated if your friend could nip into the library as I'm hoping that the address will give me information on family living there, as opposed to it just being a rented address with no other links.
Many, many thanks,
Sally