Could anybody tell me if there are any Zbrush courses in Ireland?I would really appreciate any info.
Not specifically no, although try looking for any schools that offer 3D anything in general your bound to run across one offering ZBrush.
If distance isn’t a problem check this out: http://www.darttinstitute.ca/
save your money.
stick with gnomon or digital tutors DVD or online training.
best instructors for a fraction of the tuition in a class of 20-30
plus you can learn at your own pace
good luck