Wow I lived in Ireland for a number of years, Co. Westmeath & I've been to Belfast. I distributed a lot of Pure Land books from the Amitabha society in the Irish Library sytem. Here's a link to a pure land buddhist website in Ireland: http://www.purelandbuddhism.com/items.html
This guy popped up after I left. Anyway I can tell you that there is a Vietnamese Mahayana temple Long Van Temple, 23 Kilronan Court,Cloudellen, Dublin 22 phone: (01) 457-7020. Unfortunately I had no car, so I never went.
There is a great Jodo Shinshu temple in London 3 Wheels & Rev. Sato used to write to me & is a great teacher.http://www.threewheels.co.uk/
There is also a Fo Guang Temple in London; they combine Ch'an and Pure Land, nice bunch. http://www.londonfgs.org.uk/
Finally my sect Jodo Shu has an online sangha: over at google groups: http://groups.google.com/group/jodoshubuddhism
we have Stephen & Shinri both ordained priests who are regulars, Bishop Atone will also answer questions. So feel free to visit.
the net is amazing; a long way from the days when I practiced alone, just with my beads in the middle of the country