Water quality monitors installed in response to toxic pollution near England’s largest lake are ineffective, campaigners have claimed.

The Environment Agency (EA) installed the monitors at Cunsey Beck, which feeds into Windermere in the Lake District, after a fish kill in June 2022 in which “100% of life” within the river was suspected to have died.

Save Windermere campaigners claimed a test they carried out using non-toxic dye showed the equipment was wrongly placed, meaning it could not pick up flow coming from a nearby sewage pipe.