Fintan,
Thanks for your reply. I have now found that Patrick (my Grandfather) was born in Liverpool in 1897 to Charles and Margaret and think I have found Charles' father (another Patrick) born in 1828 and married to Elizabeth. Apart from the 1891 census I can find no trace of Patrick in the UK and think he might have been born in Dublin ... and so the search continues!
Have found a Patrick Supple b 1828 listed in some public family trees but need a full membership to view them - will probably go this route as my curiosity is getting the better of me!
Am wondering is there a connection with your Supple's in early 19th Century Dublin as there seems to be fewer Supples in Dublin then say in Cork, where they are quite numerous.
all the best
Orla