There are interesting reports of sewage seen from the towpath and “vile smells” from the river.

This is just a couple miles from the Olympic Park.

Sam Amalemba, speaking at the Lee Valley Canoe and Cycle Centre near Stonebridge Lock says: “It is not as bad in the north of the river as it is further south. There’s actually a very noticeable difference. You just have to go near Markfield Park and you can smell it.”

This news comes just a day after Thames Water announced plans to stop sewage entering the downstream Bow Back Rivers.

British Waterways, the Environment Agency, Thames Water and the Olympic Delivery Authority are in talks about the situation.