Sent the information to my uncle and auntie in Ireland (so that they could put Irish cheque in with the application) and the certificates arrived after ten days! Much better service than over here, and much cheaper too!
Thanks for all the help with the dates.
Have now found:
Matthew and Bridget Cullen married 25 Jun 1906. Parents Matthew Cullen, Barnacullia and Francis Cullen, Woodside. That'll give me something to go on. Bridget died 18 Mar 1914 of septic peritonitus. Trying to find her other children now. I've got Sarah, Elizabeth and Mary on 1911 census. I met Annie when I was a child. Not sure when she was born, but obviously after 1911 census and before Mar 1914. Think there was a boy too, but not sure about that.
Also got Matthew's parents' wedding cert, Sarah (Seragh) Rothery (servant in Murphystown) and Matthew Cullen (stone cutter in Bootastown), 15 Jun 1871. Parents: Denis Cullen (Mason) and James Rothery (Labourer).
Anyway, thanks again everyone :-)