Britain hasn´t always been an island. It became one only after the end of the last ice age. The first evidence of human life is a few stone tools dating from one of the warmer periods, from about 250,000 BC. There were two different kinds of inhabitants. During the times around 50,000 BC, a new type of human being seemed to have arrived, who was an ancestor of the modern British. These people looked similar to the modern British, but were smaller.
Around 10,000 BC, Britain was inhabited by small groups of hunters, gatherers, and fishers.
By about 5,000 BC, Britain had finally become an island.