Across the UK, toxic chemical leaks are poisoning our water supplies and seeping into soil, affecting the lives of people living nearby. From the food we eat to the air we breathe, the impact can reach into gardens, playgrounds and homes and the consequences can be catastrophic. Investigative journalists Dan Ashby and Lucy Taylor join Dave Megson to reveal what they discovered in South Wales, questioning how widespread the problem really is and why we should all be concerned.