Hi, Clive -
Sorry to dust off such an old thread, but I couldn't seem to PM you.
I think the John Moore (shoemaker) you mention is my great-great-great-grandfather. My grandfather's father was the son of John Conlon and Margaret Moore, who were married in Rathfriland in 1864. On their marriage certificate, Margaret (aged 17 at the time) lists her father and his occupation as John Moore, a shoemaker. I have John's death certificate, but have not yet been able to obtain information on when (and to who) he was married, or when he was born (all I have to go on there is the age given on his death certificate.)
Hopefully we have the same John Moore and can be of some help to each other.