I wont be too hard on them about England and Ireland. But that is because thoses island are supposed to be such a strong Elven place in the 4th world and we just dont know how the IE-Dragon war ended in the 4th world.
More Great Dragon here could be simply that before going to sleep the Dragons put some of their younger and more actives brethren to stay i the area and keep a look on the stronger IE settlement since BloodWood demise and Theran diaspora...