Matt Baker and Ellie Harrison are in the Lee Valley, the green lung of London. Ellie takes to the water to see what is being done to clean up its chalk streams. Show more
Discover 11,128,835 listings and 277,888 playable programmes from the BBC
Matt Baker and Ellie Harrison are in the Lee Valley, the green lung of London. Ellie takes to the water to see what is being done to clean up its chalk streams. Show more