Thank you, Shane. I wonder if all the Church of Ireland details are on the site you've given me?
 It's a bit of a mystery.  On his naval papers it gives details of his baptism and this is authorised by two church officials.  However, as you say, there is no evidence of a baptism, and the two officials are non-existent.  I can only assume that he lied to the Naval Board.  A brother and sister were baptised at St Audeon's, so perhaps I should be looking there.
Thanks again for your response.