In the UK the following applies:
Have at least a CPL(A) or have completed at least
200 hours of flight time of which 150 hours as Pilotin-
Command if holding a PPL(A).
There are some additional requirements. Search the CAA website for LASORS, look in section H (74 MB download).
I'd assume the Irish regulations are similar if not the same. You might actually have to contact the IAA (they really are quite helpful as long as you don't have to deal with the medical division)