There are 10 large regulated water-and-wastewater companies in the UK.

Each has a parent, which is more or less unregulated, upon which it relies for financial support.

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Famed and celebrated across the world, Windermere is England's most iconic and largest 'natural' lake.

But all is not well beneath the picturesque surface.

Nutrient pollution and water quality are the main reasons for current concerns about Windermere's health.

Cumbria Wildlife Trust, 2024