Thank you for the replies (and apologies for the delay in responding, as I was out of the country for a time).
I intend to apply, following a period of training and test, via the UK, using Form SRG 1104. Once the licence is issued I will transfer to the IAA to hold everything under one authority. Hopefully they will accept my EASA Medical, although I am still concerned about that as in the 1104 para 3 it states:
A licence will not be issued to any person unless their medical records supporting their Part-MED medical certificate are held by an Aeromedical Centre located in the United Kingdom. European Commission Regulation (EU) No. 1178/2011 as amended, requires that an individual has all of their licences administered by the National Aviation Authority that holds their medical records (Part-MED.A.030 and Part-FCL.015).
This was the initial quandry as I cannot apply for a renewal in Ireland, for a licence issued in the UK, and getting a medical in the UK is a bit of a pain, as I've been told that as my last UK medical was >5 yrs O.O.D. (although I have held a valid class 1 in Ireland for the last 13 yrs) I would have to get a full initial Class 1 at a UK aeromedical centre. So I have my fingers crossed, especially as my only intention once the licence is issued is to transfer it immediately to the IAA.
I'll let you know if it works