This stretch of the Wharfe in Ilkley looks idyllic, but all is not well beneath the surface. Like most of our rivers, it is in fact, under threat from pollution and the problem is that pollution isn't ...

I'm on the Thames in London, a river which has long suffered from sewage pollution. Finally, there is now a ray of hope for this legendary river. (to Darren) Hello. Nice helmet. Thanks very much.