In Great Britain, the Bronze Age is considered to have been the period from circa. 2100 to 700 B.C. Immigration brought new people to the islands from continental Europe. Where the weather was once warm and dry it became much wetter as the bronze age continued, forcing the population away from easily defended sites in the hills and into the fertile valleys. Tin and copper was required for the production of Bronze, and Cornwall was a major source of tin for much of western Europe. Copper was extracted from sites such as the Great Orme mine in northern Wales.

