thanks hallmark, I'd poked round the web and ascertained that Ballybeg and Drummin were not too far away (about a mile as the crow flies).
I've progressed quite well, and now have the barebones structure for Patrick's family. The 'female' birth registration in 1884 remains a mystery.
The death date is missing for Kate (born1890) and I still have that 'possible, but definitely in query' death register entry for a child of Patrick and Ellen, name of Katie. The death was registered in 1903 and the age at death on the register is 1 yr and 6 months. The one born in 1890 would have been about 12 years and eight months in 1903 and I do wonder if her Dad said she was 12 and a half and the registrar missed the 2 from the end of the 12 when he wrote it down. Odder things have happened :-)
The household return for 1901 would help to clear up the mystery - if she is on there then that can't be her death, but I have had no reply to my queries either from the National Archives of Ireland or Wicklow Heritage. Having been through the National Archives site, it seems that they don't supply copies of documents unless the customer turns up in person, so that is starting to look like a dead end.
I am pleased with the progress and very grateful for all the help I have received in here.
Boo