The New Stone Age (Neolithic) period ran between 4300 and 2000 BC

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Large-scale cultural changes probably brought about by a wave of immigration from Europe (Spain - Iberia and Anatolia) at the start of the New Stone Age. This was the "Neolithic package": polished or ground stone tools, settled villages with rectangular buildings, pottery, and the domestication of animals and plants to produce food (agriculture).

Mainland Europe had had all this for a long period already.

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Farming led to mass human-led deforestation to create agricultural land and grassland for animal grazing.

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Before 3000BC

long barrows for communal burial 
Sweet track
Skara Brae/Orkney sites
drinking cows milk

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After 3000BC

henges: stonehenge/avebury/silbury 
flint mining (grimes graves)