River flowing past the white 'Bake Off' tent is among those polluted by chemicals and tyre particles.
A toxic mix of oil, chemicals and bits of tyre from roads is polluting English waterways and no-one is regularly monitoring it, the BBC has found.
Heavy rain forces run-off into streams and rivers. Campaigners say it causes 'absolutely horrific' damage in places, including just downstream of where The Great British Bake Off is filmed.
England's major road network has more than 18,000 outflows or drains.
National Highways runs the network and says it's working to improve them.
Very worrying that this is not something that is monitored. The state of our waterways is already a disaster and surely this will be contributing to that. This will have only been getting worse recently as more and more people have been purchasing unnecessarily large cars like SUVs.
I don't see this being something that will be changed under the Tory government considering Sunak's recent efforts to create a culture war between motorists and non-motorists...
A toxic mix of oil, chemicals and bits of tyre from roads is polluting English waterways and no-one is regularly monitoring it, the BBC has found.
Campaigners have been doing their own testing and told the BBC they had found micro-plastics, heavy metals, toxic chemicals like arsenic and carcinogenic compounds from car tyres.
"We don't fully understand the impact these contaminants have as a cocktail but we know they can be toxic to aquatic life and potentially contribute to the poor ecological status of some rivers," he said.
A chalk stream, the Lambourn's crystal clear water winds through Welford Park, home of The Great British Bake Off's white tent, before passing underneath the M4 motorway.
"Look at this black gunk," Charlotte Hitchmough, the director of Action for the River Kennet (of which the Lambourn is a tributary) says as she scrapes a net along the bottom.
"It literally keeps me awake at night,"says Jo Bradley, a former Environment Agency employee who has now dedicated herself to raising awareness of road run-off.
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I don't see how monitoring the many kinds of damage caused by road traffic would do an ounce of good: everyone loves their cars, and our infrastructure - not just England's - relies on fossil-fuels use.