The birth certificate seems to indicate he was illegitimate. Are any illegitimate children listed around that period in the parish register? Another possibility that he was older than the birth registration indicates but I suspect you've already checked for earlier entries/
Yes, he was illegitimate, hence no father's namein the civil registration, and why I am interested in finding a baptismal record. And yes, I did check back for an earlier baptismal entry - none obvious.
One reason I posted this query was because it may be of some interest as the reverse of the usual case, i.e. where a baptism exists, but not the civil registration.
As for your other question, regarding whether other illegitimate children appear in the baptismal register, it is 18 months since I looked, and I am afraid I don't recall. And as Moses is a very distant DNA match, I lack the motivation to go back and recheck!