>> Oh and why isn't northern ireland in JC's books?

Time and space I would imagine. You could similarly ask why isn't Northern Spain or the depatment of Lot (France) or Austria or the Paris basin or Caucasia or lots of other places in the book?

As Peter says there's stuff all over Europe. For various reason a lot of the European stuff has been ignored. One terrible factor has been the reluctance of archaeos to look beyond their own shores for comparisons. I think we owe quite a bit to The Megalithic European to opening up the borders. The Portal is now uniting a growing number of them online - I might even look at it before my trip to Germany next month ;-)