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The latest analysis covers four years of data from six sites that discharge sewage into the Lake Windermere catchment.

About 24 million chickens, a quarter of the UK's poultry production, are raised in the river's catchment area.

We met up with Tony Juniper of Natural England at the site of the pilot project for wild beaver release in England, the River Otter catchment in Devon.

All primary schools in both Holyhead and the Amlwch catchment area have announced they will remain closed on Friday, while many schools in western Anglesey also decided to shut due to the weather risks.

Parents of children that turn five in the next academic year have been asked to contact the school in the catchment area they live in by 31 January.