A former ranger tells the story of how the UK’s forests intimately shaped – and were shaped by – its people

It may not sit well with the politicians who now seek to govern it, but Britain has always been a land of immigrants – our “native” fauna and flora among them. More than 10,000 years ago, in the wake of retreating ice sheets, trees from the warmer south began to re-colonise this chilly north-western fringe of Europe: first birch, then hazel, elm, oak and alder. By the time rising sea levels submerged the marshy lowlands connecting it to the rest of the continent, the new British mainland was covered in a luxuriant tangle of forest. In this primeval wildwood, a squirrel could leap tree-to-tree from north coast to south, east coast to west.

Or so one story goes. In Ancient, woodland expert Luke Barley sets out to tell a more complex and fascinating tale of our forests and the people that have lived with and made use of them. His title points back to the post-ice age woodland and its forerunners in sweltering or wintry deep prehistory, but it also holds a more specific meaning. Under classifications drawn up in the 1970s, a UK wood is considered “ancient” if it was already in existence by 1600 (in Scotland, by 1750), as shown on the earliest accurate maps. These are our last links to the wildwood, places where the undisturbed soil still supports a rich and intricate ecosystem that no human ingenuity can recreate.