Concern over experiments near home of boy who died
Zane Gbangbola's parents say he was killed by toxic gas from a former dump after the Thames flooded.
BBC News
The River Thames, known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.
Zane Gbangbola's parents say he was killed by toxic gas from a former dump after the Thames flooded.
Samples taken by the TV naturalist show high levels of norovirus and E. coli in part of the Thames.