The Foods Standards Agency is reviewing how it monitors 330 hill farms in Wales, 25 years after the world's worst nuclear accident at Chernobyl.

Rain carried radioactive material to north Wales after the explosion at the Ukranian plant in 1986.

Sheep from affected areas are still scanned before entering the food chain.

Farmers living under the restrictions say any changes to the system, by the Food Standards Agency, must maintain customer confidence.

In the weeks and months following the accident on 26 April 1986, more than 5,000 farms were placed under restrictions.

Over the years this number has come down to the current 330 in Wales and eight in Cumbria, England....