Former metal mine waste affecting river water quality in west Wales

There's a warning that Wales's industrial past is coming back to haunt it in the shape of pollution from disused metal mines.

It's the main reason that large stretches of our rivers and waterways are failing European quality standards. The cost of the clean up could run into hundreds of millions of pounds, but finding anyone to pay for it is proving a real headache for the authorities.

Watch Kevin Ashford's report: