I can only speak for LH.
Iīm sorry to say, that I havenīt flown with (or know of) either Irish nor British colleages in our company..
If you are interested in an employment, check out the Lufthansa.com page (should be Careers>Pilots)
Not to discourage you, but the student pilot graduates waiting list of our Lufthansa Pilots School in Bremen (north Germany) is very long.
Rgds