Unless I misread earlier posts, he already knows about Ireland, and he's looking only for the most up-to-date info (IE, changes between 3rd and 4th). It was my assumption, then, that he's already got Shadows of Europe, London Sourcebook, and Tir na nOg.
And in recent years, it most certainly isn't Lofwyr's playground. To investigate that angle more fully, just take a look at Dragons of the Sixth World, which shows just how many of the wyrms there are, particularly in Western Europe (Great Britain, for example) that -- between them and rival megacorps -- would dispute that.