Hi Marg, yes I get to the history museum as often as I can, I haven't been for a while though due to work commitments I had to shelve my research for a few months, but now the dark nights are back its full steam ahead again. I would think looking at the marriage details you found that Cecilia and William were possibly RC, but perhaps Edward Marlow was C of E, hence Emma's baptism at St Paul's. correct me if I'm wrong but am I right in thinking that if Cecilia and William had separated being of the RC faith a divorce would not have been allowed or is my mind working overtime?. Also as I said earlier I found a death listed for a William Naughten in Ireland 2 years after the wedding DOD 1879, if this is the same William then perhaps he went back home for some reason and Cecilia stayed in England with her family, she may not have know he had died explaining why no marriage can be found to Edward Marlow, I get the impression that Cecilia was not a very well educated young lady, on Emma's birth cert it says " X the mark of Cecilia Marlow formally Fahy" this indicates to me she couldn't write and if my memory serves me right I'm sure last time I looked for her I found her listed in a census as an imbecile which I think would also indicate that she couldn't write and possibly not able to read. Perhaps she spent her adult life thinking she was an adulteress when she was actually a widow.
As you say Marg its strange you could find no baptism records next time I'm at the history museum I will see what I can find, also I want to try and find were she is buried, it could be the Queen St cemetery or possibly Rycroft which opened in 1894, I hope its the later as I have more chance of finding the grave as Queen St is long gone. Thanks.. Dave