Drinks giant Diageo says it is 'sincerely sorry' after toxic pollution killed 'thousands' of fish in a Spey tributary

Caustic soda is suspected to be the chemical that flowed into Knockando Burn in Moray in May, reportedly originating from Diageo's Cardhu Distillery. According to the director of the Spey Fishery Board, a 2km stretch of the burn has been 'destroyed', with recovery potentially taking years. Fly fishers say the burn's salmon population has been wiped out entirely. The Scottish Environment Protection Agency's investigation remains open and may result in a referral to prosecutors.

Birds, eels and frogs also perished in the toxic spill alongside the fish.

Diageo says it has 'updated controls' and is discussing a long-term restoration plan.