Rye House power station dumped the ash in the nearby gravel pits of Lea Valley, which is quite good for orchids. https://www.theguardian.com/science/2016/mar/2

Rye House power station dumped the ash in the nearby gravel pits of Lea Valley, which is quite good for orchids. https://www.theguardian.com/science/2016/mar/23/plantwatch-simons-industrial-poor-soil-tips-orchids-farming-fertilisers https://www.theguardian.com/science/2016/mar/23/plantwatch-s...