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Population movements

11,700 years ago
About 11,700 years ago, glaciers permanently receded from Britain as the last Ice Age ended, but sea levels were lower. Hunter-gatherers migrated into Britain via a land bridge and established a small population. These are the populations to which Cheddar Man (alive around 10,000 years ago) belonged.

DNA analysis suggests their general appearance was likely to be:
Eyes: blue/blue-green/hazel
Skin: intermediate dark brown/black
Hair: dark

6,000 years ago
About 6,000 years ago, farmers originating from the Mediterranean moved into Britain. Their ancestors had come from modern-day Turkey. This farming population was probably much larger than that of the hunter-gatherers, and brought new technologies that marked the beginning of Neolithic (or New Stone Age) Britain.

Studies suggest that the earlier hunter-gatherers contributed little ancestry to the population that made up Neolithic Britain.

DNA analyses suggest their appearance was variable but typically likely to be:
Eyes: brown
Skin: intermediate-dark brown
Hair: dark

4,400 years ago
About 4,400 years ago, a second population of farmers entered Britain, bringing with them distinctive Beaker pottery. This population came over from continental Europe. Their ancestors had mostly come from the Eurasian Steppe. They brought new technologies that marked the end of the Neolithic and the beginning of the Early Bronze Age.

Studies suggest that within a few hundred years of this migration, only 10% of the British population's gene pool came from the earlier Neolithic famers.
DNA analysis suggests their general appearance was variable but typically likely to be:
Eyes: lighter
Skin: lighter-intermediate
Hair: lighter

Source: Natural History Museum, London