Thanks, yes I'd spotted that but hoped that it indicated that the next tranche had been added but sadly, haven't found any more new records for my family yet.
However, i shouldn't be greedy as the ones that I have so far have been very useful. Especially as they include a baptism with birth details for someone who doesn't appear to have been registered.
On this subject, does anyone know if, in the 1870s, Ireland had a two-stage registration system like in England so that local registers might possibly have entries that accidentally did not get passed on to the national register? And, if so, can these local registers still be accessed?