Thanks so much for your detailed reply, it's very much appreciated
It seems I may have got my hopes up prematurely! I wasnt aware Griffiths Valuations didnt list married couples and the dates are too late so this wont be the John and Rose I am looking for unfortunately
I have Bridget Mullen's death certificate but I havent yet located John's or Rose/Rose Ann's. I will keep looking though!
Bridget died on 16/03/1893 in Glasgow at age 61 and the cert lists her parents as John Mullen and Rose Ann Mullen (MS Dumphrie on this however this is the 4th close variation of her maiden name I have seen!). Both were deceased by this point. The last trace I can find of Rose in Scotland is 1875 so I have a window from 1875 to 1893 to search.
I had got my hopes up on this one due to the relative proximity of Kiltest to the Antrim border as I know Rose was born in Co Antrim and John Mullen in Co Derry. I also know they had Bridget in Co Derry in 1833 and at least 2 other children once they moved to Glasgow.
The info you have kindly provided means it's unlikely to be them (but could be relatives of theirs) and it might be difficult to find records from the 1830s. I have had a bit more success with Bridget's husband, Denis Burns, on the Fermanagh side so I might try and chip away at that a bit more!
Thanks again for your help, much appreciated