As to the topic, I agree with Pundit and Termi. For whatever reason, civilization sprung up around the Mediterranean. All peoples that were not cut off from it eventually were influenced by it through colonization, trade and other forms of diffusion as Termi puts it.
Britain well under 2000 years ago was a place full of mud huts and so-called primitive savages whom Roman missionaries were afraid to visit due to their so-called primitive and savage ways. People love to lump all Europeans together as if all Europeans were the Romans and the Greeks when these were two very, very tiny groups of peoples in a very small corner of the world that was perpetually and very connected to Asia.
The same Romans that conquered Britain and Ireland also conquered North Africa and parts of Asia. Were it not for the jungles and desserts, there's really no reason to think they, or the Greeks before them or the Persians before them would have failed to colonize even Cape Point and Mombasa at the same time as they were colonizing the "savage/primitive" folk of Britain.
Lots of peoples around the world that were disconnected and did not discover agriculture were not all that different from Africans before colonization came upon them, just like the Irish were not that different before colonization, and even on our continent, these changes were still happening at different paces in different societies by the advent of colonialism 200 years ago, sometimes because of diffusion through the Arabs.
