Mother Nature doesn't care how people talk about her.

Antoninus said:

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Britain was colonized in three distinct waves, and the people of each new wave essentially replaced the people of the preceding wave. DNA mapping seems to indicate that there was little interbreeding.

The first wave were the Western Hunter Gatherers, including Cheddar Man. They reached Britain 12-15 thousand years ago.


The next wave were the Neolithic Farmers, who reached Britain about 6000 years ago and looked like this woman:


They were replaced by the Bell Beaker culture, who reached Britain about 4500 years ago and looked like this woman:


And she is basically how the island's residents looked from that point forward, but the builders of Stonehenge (and Oldgrange) were most-likely descendants of the second wave ... the Neolithic Farmers. Stonehenge DNA article

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This looks plausible, but there seems to be a lot of objection.
I have always thought that red hair developed from the need to get out and gather food during the autumn (prepare for winter) when the trees had red/orange leaves.
Oh, and blonde hair matches very nicely with the color of prairie grass in the autumn.
But the closer to the equator one goes, the more dark skin helps to protect from the sun.