'Few stink and simmer with pollutants like West Midlands rivers' – Mike Lockley on region's clean-up battle

They appear still a shimmering, magical and mesmerising part of England’s landscape. They are the arteries that bring liquid life to every corner of our country.

In some areas, waterway scenes still resemble Constable paintings. Yet looks are deceptive and the clear water disguises chilling tales of the stinking, chemical riverbank.