marsh marigold and watercress. The wetland plants "naturally clean the water, removing ammonia and phosphate before it goes back into the nearby river", Anglian Water said. Dr Jonah Tosney ...

He added: 'The main sewer burst half a mile away from the farm, and it ran down the hill into the watercress beds. 'They're connected to the river, and it all backed up into 55 per cent of the area.' ...