Hey Ronnie,
I'm from Co. Wicklow and am currently a student pilot on a University Air Squadron in England. Until recently citizens of the Republic of Ireland and the Commonwealth were eligible to join the RAF. That rule has now been changed. I was able to join because my dad is English which entitles me to British nationality.
If you are serious about the RAF then I would highly recommend getting yourself a British passport. It will make life much easier.
As for life on the squadron, its one of the best things I've ever done. I get a lot of banter but its all good natured and for the most part Irish people are well equipped to dispense abuse of their own.
If you have any other questions feel free to PM me.