Got myself DNA tested. I seem to have a lot of Hunter-Gatherer heritage.
Those ancestors may have looked like the picture below: see Dark Skin, Blue Eyes – the Original Europeans
Not at all like me. Skin colour got lighter for Britons when we got less fresh meat, which is a good source of Vitamin D.
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Update – July 2021. More data since 2017, when I posted this originally.

The maternal line is that of the West Asian farmers who changed all Europe.

The paternal line comes from the metal-age invaders.

Interesting to know. A record of past conquests.
I’ve done a blog about this: Europe’s Brutal Prehistory.