Did some googling. From what I can tell, almost all cows in Ireland are grass-fed -- beef, veal, dairy etc. The industries there just aren't big enough to make the American CAFO-model profitable (thank goodness). However, many cows need grain-finishing in winter. My advice would be to stock up on butter in summer and freeze it. Then you're sure to get summer grass-fed butter.
5'0" female, 43 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Current weight: skinny-fat 106 lbs. Resetting with the 21-day challenge.
MY PRIMAL: I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I aim for 80-90 g carb/day and advocate a two-month strict adjustment for newbies. But everybody is different and other need to tweak Primal to their own needs.