Walk along the gin-clear River Itchen in Hampshire and you might see otters, salmon, kingfishers and clouds of mayflies, all supported by the unique ecosystem of the chalk stream.
The UK has no tropical rainforests or tigers; its wildlife is arguably more modest in appearance. But its chalk streams are some of the rarest habitats in the world – there are only 200, and England boasts 85% of them. If you look properly, they are as biodiverse and beautiful as any rainforest.
Despite the rarity and importance of these very pure rivers, which are full of minerals from the chalk aquifer, they have no specific legal protections. Environmentalists fear the Labour party’s planning bill will use the country’s departure from the EU to make it legal for developers to destroy them, as long as they offset the damage by paying into a fund to create nature somewhere else.